Amendment Flag Current Fiscal Year End Date Document Period End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Entity Registrant Name Entity Central Index Key Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus Document Type Award Type [Axis] Amortization of investments in other expenses Affordable Housing Project Investment, Write-down, Amount Number of securities owned with fair value less than cost Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Accounting Standards Update 2016-01 [Member] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract] Amortization and accretion on investment securities, net Accretion (Amortization) of Discounts and Premiums, Investments Accrued interest payable Accrued Liabilities, Fair Value Disclosure Accumulated Other Comprehensive Income Loss [Table] Net -of-tax amount Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Unrealized Gain (Loss) on Interest Rate Swap [Member] Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] Net -of-tax amount Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Accumulated Other Comprehensive Income Loss [Line Items] Total accumulated other comprehensive income Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Components of accumulated other comprehensive income (loss), net of tax [Abstract] Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Unrealized Gains (Loss) on Available For Sale Securities [Member] Unrealized Gains and Losses on Available For Sale Securities [Member] Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Less: accumulated depreciation Defined Benefit Pension Items [Member] Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Accumulated Other Comprehensive Income (Loss) [Member] Additional Paid-in Capital [Member] Additional paid-in capital Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to reconcile net income to net cash provided by operating activities [Abstract] Adjustments for New Accounting Pronouncements [Axis] Advertising cost Advertising Costs Roll forward of allowance for loan losses by portfolio segment Allowance for Credit Losses on Financing Receivables [Table Text Block] Amortization expense Antidilutive Securities [Axis] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities, Name [Domain] Antidilutive restricted stock excluded from net income per share calculations (in shares) Assets [Abstract] Assets, Fair Value Disclosure [Abstract] Fair Value Impaired Loans ASSETS: ASSETS: Assets [Abstract] TOTAL ASSETS Assets Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Less than twelve months, Gross unrealized losses Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Twelve months or greater, Gross unrealized losses Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Total, Gross Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Gross Unrealized Gains Due after five years through ten years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis Twelve months or greater, Fair value Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Total, Fair value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Investment securities pledged as collateral Available-for-sale Securities Pledged as Collateral Available for Sale Securities Amortized Cost, Gross Unrealized Gains or Losses and Fair Value [Abstract] Available-for-sale Securities, Fair Value to Amortized Cost Basis [Abstract] Available-for-sale securities Fair value Gross Unrealized Losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Less than twelve months, Fair value Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Due after five years through ten years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value Amortized cost Available-for-sale Securities, Amortized Cost Basis Available-for-sale securities: Securities available for sale [Abstract] Total Available-for-sale Debt Securities, Amortized Cost Basis Total Available-for-sale Securities, Debt Securities Realized investment gains (losses) [Abstract] Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] Available-for-Sale Debt Securities, Amortized Cost [Abstract] Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] Due after ten years Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value Due after ten years Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis Due after one year through five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis Gross losses Available-for-sale Securities, Gross Realized Losses Due after one year through five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value Net (losses) gains Available-for-sale Securities, Gross Realized Gain (Loss) Gross gains Available-for-Sale Debt Securities, Fair Value [Abstract] Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] Due in one year or less Due in one year or less Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Bank owned life insurance Earnings on bank owned life insurance Earnings on bank owned life insurance DEPOSITS [Abstract] Basis of Presentation Building Premises [Member] Building and Building Improvements [Member] Buildings [Member] Purchase price assigned to FNB common shares exchanged for Citizens Financial Services, Inc. Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Available-for-sale securities Securities available for sale Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities Deferred tax asset Deferred tax asset Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent Citizens Financial Services, Inc. shares issued (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Total Non-cash assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Business Acquisition, Acquiree [Domain] Noncash or Part Cash Acquisition, Name [Domain] Business Acquisition [Axis] Noncash or Part Cash Acquisitions by Unique Description [Axis] Schedule of Business Acquisitions, by Acquisition [Axis] ACQUISITION OF FNB [Abstract] Total liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Value assigned to Citizens Financial Services, Inc. common share (in dollars per share) Business Acquisition, Share Price Business Acquisition [Line Items] Total Purchase Price Total cash consideration Other assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Other liabilities Other liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other Cash and cash equivalents Cash and cash equivalents acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Net Assets Acquired for cash [Abstract] Net Assets Acquired [Abstract] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] Purchase Price Consideration - Cash for Common Stock [Abstract] Business Combination, Consideration Transferred [Abstract] Premises and equipment Premises and equipment, net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Net assets acquired [Abstract] Assets (liabilities) acquired [Abstract] Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] Net non-cash assets (liabilities) acquired Net assets acquired Acquired net assets at fair value Acquired and liabilities assumed, net ACQUISITION OF FNB Intangibles Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Asset acquired and liability assumed [Abstract] Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract] Merger and acquisition Counterparty Name [Axis] Total capital (to risk-weighted assets) Total capital (to risk-weighted assets) Capital Required for Capital Adequacy to Risk Weighted Assets Total capital (to risk-weighted assets) Capital Required to be Well Capitalized Total capital (to risk-weighted assets) Capital Required for Capital Adequacy Total capital (to risk-weighted assets) Capital to Risk Weighted Assets Total capital (to risk-weighted assets) Capital Required to be Well Capitalized to Risk Weighted Assets Carrying Amount [Member] RESTRICTIONS ON CASH AND DUE FROM BANKS Cash and Cash Equivalents Disclosure [Text Block] Noninterest-bearing Cash Cash and Due from Banks Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents at Beginning of Year Cash and Cash Equivalents at End of Year Total cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and due from banks Cash and Cash Equivalents, Fair Value Disclosure Cash and cash equivalents: Cash and Cash Equivalents [Abstract] Cash and Cash Equivalents [Member] Bank owned life insurance Cash Surrender Value, Fair Value Disclosure Cash FDIC insured amount, maximum Cash, FDIC Insured Amount Non-accretable discount Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Table] Accretable discount Balance at end of period Balance at beginning of period Business acquisition credit impaired loans purchased Estimated fair value Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value Reclassification of non-accretable discount Contractually required principal and interest at acquisition Expected cash flows Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition Components of the purchase accounting adjustments related to the purchased impaired loans in FNB Acquisition [Abstract] Loans acquired with specific evidence of deterioration in credit quality [Abstract] Changes in the accretable yield for purchased credit-impaired loans [Roll Forward] Accretion Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion Outstanding balance Carrying amount Interest bearing time deposits with other banks Interest bearing time deposits with other banks Certificates of Deposit [Member] Commercial [Member] Commercial Real Estate [Member] Other Commercial Loans [Member] Other Commercial Loans [Member] Commercial Portfolio Segment [Member] COMMITMENTS AND CONTINGENT LIABILITIES Commitments and Contingencies Disclosure [Text Block] Commitments to Extend Credit [Member] COMMITMENTS AND CONTINGENT LIABILITIES [Abstract] Cash dividends (in dollars per share) Common Stock [Member] Common Stock, authorized (in shares) Stock dividend (in shares) Common Stock Dividends, Shares Common Stock, issued (in shares) CASH DIVIDENDS PER SHARE (in dollars per share) Common Stock, par value (in dollars per share) Common Stock $1.00 par value; authorized 15,000,000 shares 2017 and 2016; issued 3,869,939 and 3,704,375 shares in 2017 and 2016, respectively Balance (in shares) Balance (in shares) Common Stock, Shares, Outstanding EMPLOYEE BENEFIT PLANS [Abstract] EMPLOYEE BENEFIT PLANS Compensation and Employee Benefit Plans [Text Block] Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] Comprehensive Loss Comprehensive income Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent OTHER COMPREHENSIVE INCOME Comprehensive Income (Loss) Note [Text Block] Condensed Financial Statements, Captions [Line Items] CONDENSED FINANCIAL INFORMATION - PARENT COMPANY ONLY Condensed Financial Information of Parent Company Only Disclosure [Text Block] CONDENSED FINANCIAL INFORMATION - PARENT COMPANY ONLY [Abstract] Consolidated Entities [Domain] Consolidated Entities [Axis] Construction in Process [Member] Construction in Progress [Member] Consumer [Member] Certificates of deposit of $250,000 or more [Abstract] Contractual Maturities, Time Deposits, $100,000 or More [Abstract] Contractual obligation Core Deposits [Member] Core Deposit Intangibles [Member] Core Deposits [Member] Corporate Obligations [Member] Corporate Debt Securities [Member] FEDERAL HOME LOAN BANK (FHLB) STOCK Cost-method Investments, Description [Text Block] Cumulative effect adjustment from acumualted other comprehensive income to retained earnings Currently payable Doubtful [Member] Variable rate basis Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Axis] Basis spread on variable rate Borrowed funds Borrowed funds Total borrowed funds Debt and Capital Lease Obligations Maturity date Stated interest rate Weighted average interest rate as of year end Schedule of Long-term Debt Instruments [Table] Debt Instrument [Line Items] Face amount of debt Borrowed funds Debt Instrument, Fair Value Disclosure Maximum borrowing limit Unrealized losses on available-for-sale securities Investment securities accretion Deferred Tax Liabilities, Investments Deferred interest expense Deferred Compensation Arrangement with Individual, Compensation Expense Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] Deferred income taxes Total Deferred Tax Liabilities, Gross Other Deferred Tax Assets, Other NOL carry forward Deferred tax asset, net Deferred Tax Assets, Net Total Deferred Tax Assets, Net of Valuation Allowance Deferred tax assets [Abstract] Deferred compensation Allowance for losses on available-for-sale securities Incentive plan accruals AMT Credit Carryforward Valuation allowance Allowance for loan losses Premises and equipment Deferred Tax Liabilities, Property, Plant and Equipment Deferred tax liabilities [Abstract] Mortgage servicing rights Deferred Tax Liabilities, Mortgage Servicing Rights Other Deferred Tax Liabilities, Other Loan fees and costs Deferred Tax Liabilities, Deferred Expense, Debt Issuance Costs Goodwill and core deposit intangibles Deferred Tax Liabilities, Goodwill and Intangible Assets Deferred compensation liability Benefits paid Defined Benefit Plan, Benefit Obligation, Benefits Paid Benefits paid Defined Benefit Plan, Plan Assets, Benefits Paid 2021 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Amounts that will be amortized from accumulated other comprehensive loss into the net periodic benefit cost in 2017 related to prior service cost (benefit) Amounts that will be amortized from accumulated other comprehensive loss into the net periodic benefit cost in 2017, related to estimated net loss 2023 - 2027 Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter Expected employer contribution to pension plan Plan assets at fair value [Abstract] Employer contribution to 401 (k) defined contribution plan Target plan asset allocations 2022 Defined Benefit Plan, Expected Future Benefit Payment, Year Five 2020 Defined Benefit Plan, Expected Future Benefit Payment, Year Three 2019 Defined Benefit Plan, Expected Future Benefit Payment, Year Two 2018 Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months Actuarial (Gain) / Loss Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) Rate of compensation increase Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase Defined Benefit Plan Disclosure [Line Items] Discount rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Actual return (loss) on plan assets Discount rate Expected long-term return on plan assets Amounts recognized in accumulated other comprehensive loss consists of [Abstract] Target Allocations of Assets [Abstract] Rate of compensation increase Fair value of plan assets at acquisition Benefit obligation at end of year Benefit obligation at beginning of year Defined Benefit Plan, Benefit Obligation Expected future benefit payments [Abstract] Change in plan assets [Roll Forward] Benefit obligation acquired as part of FNB acquisition Fair value of plan assets at beginning of year Fair value of plan assets at end of year Defined Benefit Plan, Fair Value of Plan Assets Return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Interest cost Employer contributions Funded status Defined Benefit Plan, Funded (Unfunded) Status of Plan Change in benefit obligation [Roll Forward] Weighted-average assumptions used to determine benefit obligations [Abstract] Weighted-average assumptions used to determine net periodic benefit cost (income) [Abstract] Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract] Continuation of Life Insurance Plan [Member] Service cost Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Allocation Defined Benefit Plan, Asset Categories [Axis] Components of net periodic benefit cost [Abstract] Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] Obligation included in other liabilities Liability, Defined Benefit Pension Plan Fair value of plan assets Assets for Plan Benefits, Defined Benefit Plan DEPOSITS Deposit Liabilities Disclosures [Text Block] Deposits: Money market deposit accounts Total deposits Deposits NOW accounts Deposits Deposits, Fair Value Disclosure Savings deposits Depreciation and amortization Depreciation expense Notional amount of derivative liability Director [Member] Dividend paid date Dividends Payable, Date to be Paid Dividends Dividend Income, Operating Cash dividends Dividends, Common Stock, Cash Stock dividend Dividends, Common Stock, Stock Stock dividend Dividends from [Abstract] Corporate Bonds [Member] Basic earnings per share computation [Abstract] Earnings Per Share, Basic [Abstract] NET INCOME - DILUTED (in dollars per share) Earnings Per Share Diluted (in dollars per share) Earnings per share - dilutive (in dollars per share) Diluted earnings per share computation [Abstract] Earnings Per Share, Diluted [Abstract] Computation of earnings per share [Abstract] NET INCOME - BASIC (in dollars per share) Earnings Per Share Basic (in dollars per share) Earnings per share - basic (in dollars per share) Earnings Per Share PER COMMON SHARE DATA: Earnings Per Share [Abstract] Statutory tax rates Federal corporate tax rate Effective tax rates Compensation cost related to nonvested awards that has not yet recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Period over which compensation cost is expected to be recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Furniture and equipment OTHER COMPREHENSIVE INCOME [Abstract] Ownership percentage Ownership percentage Equity Interest Type [Axis] Equity Component [Domain] Equity Interest Issued or Issuable, Type [Domain] Equity Securities [Member] Equity Securities in Financial Institutions [Member] Fair Value [Member] Discount for time since appraisal Fair Value Inputs, Assets, Quantitative Information [Line Items] Valuation Technique(s) Fair Value Measurements, Valuation Techniques Fair Value Inputs, Assets, Quantitative Information [Table] Significant unobservable inputs used in fair value measurement process Fair Value Inputs, Assets, Quantitative Information [Table Text Block] Measurement Basis [Axis] Fair Value, Hierarchy [Axis] Measurement Frequency [Axis] Nonrecurring [Member] Asset Class [Axis] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Measurement Frequency [Domain] FAIR VALUE OF FINANCIAL INSTRUMENTS [Abstract] Non-contractual obligation Fair Value Disclosure, Off-balance Sheet Risks, Amount, Liability Asset Class [Domain] Recurring [Member] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] FAIR VALUE OF FINANCIAL INSTRUMENTS Fair Value Disclosures [Text Block] Real estate acquired in settlement of loans Fair value, assets and liabilities measured on recurring basis [Abstract] Summary of assets measured at fair value on non-recurring basis Fair Value Measurements, Nonrecurring [Table Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair value of financial instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value Measurement [Domain] Level I [Member] Level II [Member] Level III [Member] Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Federal depository insurance Federal Funds Line [Member] Federal Funds Purchased [Member] Federal Home Loan Bank, advances, weighted average interest rate as of year-end Federal Home Loan Bank, advances, weighted average interest rate paid during the year Federal home loan bank stock Federal Home Loan Bank Stock FHLB Advances [Member] Federal Home Loan Bank Advances [Member] Federal Home Loan Bank, advances, highest balance at any month-end Federal Home Loan Bank, advances, average balance Federal Home Loan Bank, Advances, Activity for Year, Average Balance of Agreements Outstanding Carrying value of securities pledged as collateral Federal Funds Sold and Securities Purchased under Agreements to Resell Pledged as Collateral FRB BIC Line [Member] Federal Reserve Bank Advances [Member] Trust Loans Financial Instrument [Axis] Financial Liabilities [Abstract] Financial Assets [Abstract] Financing Receivable, Recorded Investment, Past Due [Line Items] Post-modification outstanding recorded investment Financing Receivable, Modifications, Post-Modification Recorded Investment Recorded investment of past due [Abstract] Financing Receivable, Recorded Investment, Aging [Abstract] Financing Receivable, Modifications [Line Items] Number of contract, subsequently defaults Financing Receivable, Modifications, Subsequent Default, Number of Contracts Collectively evaluated for impairment Financing Receivable, Collectively Evaluated for Impairment Individually evaluated for impairment Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment Financing Receivable, Allowance for Credit Losses [Line Items] Class of Financing Receivable, Type [Domain] Financing Receivable, Recorded Investment [Line Items] 90 Days or greater and accruing 90 Days Or Greater [Member] Individually evaluated for impairment Financing Receivable, Individually Evaluated for Impairment 60 to 89 Days Past Due [Member] Balance at beginning of period Balance at end of period Financing Receivable, Allowance for Credit Losses Financing Receivable, Allowance for Credit Losses [Roll Forward] Pre-modification outstanding recorded investment Financing Receivable, Modifications, Pre-Modification Recorded Investment Financing Receivable Portfolio Segment [Domain] Financing Receivable Portfolio Segment [Axis] Summary of financing receivable credit exposures by internally assigned grades Financing Receivable Credit Quality Indicators [Table Text Block] Collectively evaluated for impairment Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment Recoveries Financing Receivable, Allowance for Credit Losses, Recovery Total recidivism, Recorded investment Financing Receivable, Modifications, Subsequent Default, Recorded Investment 30 to 59 Days Past Due [Member] Financing Receivable, Impaired [Line Items] Financing Receivables, Period Past Due [Domain] Financing Receivables, Period Past Due [Axis] Charge-offs Financing Receivable, Allowance for Credit Losses, Write-downs Number of contracts Financing Receivable, Modifications, Number of Contracts Current Class of Financing Receivable, Type [Axis] Total past due Financing Receivable, Recorded Investment, Past Due Financing receivable nonaccrual status Financing Receivable, Recorded Investment, Nonaccrual Status Actual and Estimated Future Amortization Expense [Abstract] Net carrying value Finite-Lived Intangible Assets, Net 2018 Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Five Amortizing intangible assets [Abstract] Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Finite-Lived Intangible Assets by Major Class [Axis] Estimated Amortization Expense [Abstract] 2020 Useful Life Finite-Lived Intangible Asset, Useful Life 2021 Gross carrying value Finite-Lived Intangible Assets, Gross 2019 Finite-Lived Intangible Assets, Major Class Name [Domain] First Mortgage [Member] Other real estate owned Repossessed Assets Furniture, Fixtures and Equipment [Member] Furniture, Fixtures and Equipment [Member] Gains on loans sold Realized gains on loans sold Investment securities gains, net Investment securities gains, net Investment securities gains, net Realized securities gains Investment securities gains, net GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill and Intangible Assets Disclosure [Text Block] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Goodwill Goodwill resulting from merger Goodwill resulting from the FNB merger Goodwill impairment loss Goodwill, Impairment Loss GOODWILL AND OTHER INTANGIBLE ASSETS [Abstract] Intangible Assets [Abstract] Held-to-maturity securities Held-to-maturity Securities Home Equity [Member] Home Equity [Member] Purchased Credit Impaired Loans Impaired Financing Receivable, Policy [Policy Text Block] Interest Income Recognized Impaired Financing Receivable, Interest Income, Accrual Method Recorded Investment With No Allowance Related Allowance Interest Income Recognized Cash Basis Impaired Financing Receivable, Interest Income, Cash Basis Method Impaired financing receivables with associated allowance amount Total Recorded Investment Impaired Financing Receivable, Recorded Investment Recorded Investment With Allowance Average Recorded Investment Impaired Financing Receivable, Average Recorded Investment Unpaid Principal Balance INCOME TAXES [Abstract] Income before provision for income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Consolidated Statement of Income [Abstract] CONDENSED STATEMENT OF INCOME [Abstract] INCOME TAXES Income Tax Disclosure [Text Block] Provision at statutory rates on pre-tax income Provision for income taxes [Abstract] Total provision for income taxes reconciliation [Abstract] Effective Income Tax Rate Reconciliation, Amount [Abstract] Change in tax rate Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Provision for income taxes Provision for income taxes Provision for income taxes Other items Income taxes paid Income Taxes Effect of tax-exempt income Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount (Increase) decrease in accrued interest receivable Increase (Decrease) in Accrued Interest Receivable, Net Net (decrease) increase in deposits Increase (decrease) in accrued interest payable Increase (Decrease) in Stockholders' Equity [Roll Forward] Add: Dilutive effects of restricted stock (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Intangible Assets Other intangibles Accrued interest payable Interest and fees on loans INTEREST AND DIVIDEND INCOME: Equity securities Interest and Dividend Income, Securities, Operating, Available-for-sale Investment securities: TOTAL INTEREST AND DIVIDEND INCOME Interest income INTEREST EXPENSE: Borrowed funds Interest Expense, Borrowings Deposits Interest Expense, Deposits TOTAL INTEREST EXPENSE Interest expense NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES Interest Income (Expense), after Provision for Loan Loss NET INTEREST INCOME Interest Income (Expense), Net Nontaxable Taxable Interest-bearing deposits with banks Certificates of deposit Interest paid Interest-bearing Accrued interest receivable Interest-bearing Deposits [Member] Interest-bearing Interest-bearing Deposits in Banks and Other Financial Institutions Internal Credit Assessment [Axis] Internal Credit Assessment [Domain] Regulatory stock Investment in Federal Home Loan Bank Stock, Fair Value Disclosure Brokerage and insurance Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions Investment Tax Credit Carryforward [Member] Investment Securities INVESTMENT SECURITIES Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Summary of amortized cost and fair value of debt securities by contractual maturity FEDERAL HOME LOAN BANK (FHLB) STOCK [Abstract] Investment in subsidiary [Abstract] Investment Securities [Abstract] INVESTMENT SECURITIES [Abstract] Long-term Debt, Type [Domain] Long-term Debt, Type [Axis] Salaries and employee benefits Salaries and employee benefits Land [Member] Total rental expense OPERATING LEASES [Abstract] TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity LIABILITIES: Liabilities [Abstract] TOTAL LIABILITIES Liabilities Liability for uncertain tax positions Liability for Uncertainty in Income Taxes, Current Financing Receivable, Troubled Debt Restructuring [Domain] Financing Receivable, Troubled Debt Restructuring [Axis] Repayments Loans and Leases Receivable, Related Parties, Proceeds Loans, allowance for loan losses Allowance for loan losses Allowance for Loan Losses Loans and Leases Receivable, Allowance for Loan Losses Policy [Policy Text Block] Foreclosed Assets Held For Sale Loans (net of allowance for loan losses: 2017, $11,190; 2016, $8,886) Net loans Loan Charge-off Policies Total financing receivables Loans and Leases Receivable, Gross Balance, beginning of year Balance, end of year Loans and Leases Receivable, Related Parties Loans to Related Parties [Roll Forward] Loans and Leases Receivable, Related Parties [Roll Forward] Loans held for sale Loans Held-for-sale, Fair Value Disclosure Troubled Debt Restructurings Net loans Loans Receivable, Fair Value Disclosure Loans held for sale New loans LOANS AND RELATED ALLOWANCE FOR LOAN LOSSES Loans, Notes, Trade and Other Receivables Disclosure [Text Block] 2022 Long-term Debt, Maturities, Repayments of Principal in Year Five 2021 Long-term Debt, Maturities, Repayments of Principal in Year Four 2020 Long-term Debt, Maturities, Repayments of Principal in Year Three 2018 Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 2019 Long-term Debt, Maturities, Repayments of Principal in Year Two Thereafter Long-term Debt, Maturities, Repayments of Principal after Year Five Number of claims pending Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Axis] Maturities of borrowed funds [Abstract] Greater than 90 Days [Member] Up to 30 Days [Member] 30 - 90 Days [Member] Maximum [Member] Term Loans [Member] Minimum [Member] Mortgage Loans on Real Estate, Loan Category [Domain] Portfolio balance under MPF Formal foreclosure proceedings on potential foreclosure assets Mortgage Loans in Process of Foreclosure, Amount Mortgage Loans on Real Estate, Description, Loan Category [Axis] Mortgage-backed Securities in Government Sponsored Entities [Member] Municipal Bonds [Member] Nonperforming [Member] Nonperforming Financial Instruments [Member] Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Cash Flows from Financing Activities: Cash flows from financing activities [Abstract] Cash Flows from Investing Activities: Cash flows from investing activities [Abstract] Cash Flows from Operating Activities: Cash flows from operating activities [Abstract] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Net income NET INCOME Net income Net income applicable to common stock Adjustments for New Accounting Pronouncement [Member] Recent Accounting Pronouncements Noncash or Part Cash Acquisitions [Line Items] Non-cash assets acquired Noncash or Part Noncash Acquisition, Value of Assets Acquired [Abstract] Liabilities assumed Noncash or Part Noncash Acquisition, Value of Liabilities Assumed [Abstract] Noncash or Part Cash Acquisitions [Table] Noncash or Part Noncash Acquisitions [Table] Non-cash activities: Covenant not to Compete [Member] Covenant not to Compete [Member] Noncompete Agreements [Member] NON-INTEREST INCOME: Noninterest-bearing NON-INTEREST EXPENSES: TOTAL NON-INTEREST INCOME Non-interest income Noninterest Income Other Noninterest Income, Other Operating Income Non-interest-bearing deposits TOTAL NON-INTEREST EXPENSES Non-interest expenses Total Financing Receivable, Net Notes Payable [Member] Number of operating segments Other comprehensive income (loss) before reclassifications (net of tax) OCI, before Reclassifications, Net of Tax, Attributable to Parent Occupancy Thereafter Operating Leases, Future Minimum Payments, Due Thereafter 2019 Operating Leases, Future Minimum Payments, Due in Two Years Future minimum rental payments under operating leases [Abstract] Total Operating Leases, Future Minimum Payments Due OPERATING LEASES Lessee, Operating Lease, Disclosure [Table Text Block] 2018 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2022 Operating Leases, Future Minimum Payments, Due in Five Years 2021 Operating Leases, Future Minimum Payments, Due in Four Years 2020 Operating Leases, Future Minimum Payments, Due in Three Years SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Income tax benefit Reclassification adjustment for (gains) losses included in income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Securities available for sale Change in unrecognized pension costs Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax Income tax benefit Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax Pension costs Total Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax Reclassification Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax Other, net Other assets Net loss Prior service cost Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax Unrealized holding loss during the period Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax Income tax benefit Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Securities available for sale Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Other liabilities Investment amount in partnerships Foreclosed assets held for sale [Abstract] Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract] Foreclosed assets held for sale Other Real Estate, Foreclosed Assets, and Repossessed Assets Other Expenses Investment sale receivable Other Comprehensive income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Net other comprehensive income Net other comprehensive income Performing [Member] Performing Financial Instruments [Member] Age analysis of past due financing receivables Pass [Member] Parent Company [Member] Company [Member] Net increase in loans Payments for (Proceeds from) Loans and Leases Purchase of Regulatory Stock Payments to Acquire Federal Home Loan Bank Stock Originations of loans held for sale Payments for Origination of Mortgage Loans Held-for-sale Dividends paid Cash dividends paid Payments of Ordinary Dividends, Common Stock Purchase of securities Purchases of available-for-sale securities Payments to Acquire Available-for-sale Securities Purchase of treasury stock Payments for Repurchase of Common Stock Acquisition, net of cash paid Payments to Acquire Businesses, Net of Cash Acquired Purchase Price Consideration in cash Purchase price assigned to The First National Bank of Fredericksburg common shares exchanged for cash Purchase of premises, equipment and software Payments to Acquire Productive Assets Employee Benefit Plans Pension Plan [Member] Plan Asset Categories [Domain] Portion at Fair Value Measurement [Member] Preferred Stock , par value (in dollars per share) Preferred Stock $1.00 par value; authorized 3,000,000 shares 2017 and 2016; none issued in 2017 or 2016 Preferred Stock , issued (in shares) Preferred Stock , authorized (in shares) Reclassification Proceeds from redemption of Regulatory Stock Proceeds from Sale of Federal Home Loan Bank Stock Net increase (decrease) in short-term borrowed funds Proceeds from sale of interest bearing time deposits with other banks Proceeds from long-term borrowings Proceeds from maturity and principal repayments of securities Proceeds from sales of available-for-sale securities Proceeds from the sale of available-for-sale securities Proceeds from sale of securities available-for-sale Proceeds from sale of premises and equipment Proceeds from sales of loans held for sale Proceeds from sale of foreclosed assets held for sale Reissuance of treasury stock to employee stock purchase plan Proceeds from Sale of Treasury Stock Professional fees Premises and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Summary of premises and equipment PREMISES & EQUIPMENT [Abstract] Premises and equipment Premises and equipment, net Premises and equipment, gross PREMISES & EQUIPMENT Property, Plant and Equipment Disclosure [Text Block] Property, Plant and Equipment [Line Items] Useful life Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Provision for loan losses Provision (benefit) CONSOLIDATED CONDENSED QUARTERLY DATA (UNAUDITED) Quarterly Financial Information [Text Block] CONSOLIDATED CONDENSED QUARTERLY DATA (UNAUDITED) [Abstract] Range [Domain] Range [Axis] Gross gains and losses on available-for-sale securities LOANS AND RELATED ALLOWANCE FOR LOAN LOSSES [Abstract] Amounts reclassified from accumulated other comprehensive income (loss) (net of tax) Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent Schedule of the significant amounts reclassified out of each component of accumulated other comprehensive loss Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Amount Reclassified from Accumulated Comprehensive Income (Loss) [Member] Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income [Axis] REGULATORY MATTERS [Abstract] REGULATORY MATTERS Regulatory Capital Requirements under Banking Regulations [Text Block] Related Party Transaction [Line Items] Related Party [Domain] Related Party [Axis] RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] RELATED PARTY TRANSACTIONS [Abstract] Repayments of long-term borrowings Repayments of Long-term Debt Counterparty Name [Domain] Mortgages [Member] Residential Mortgage [Member] Residential [Member] Residential Real Estate [Member] Restricted Stock [Member] Cash reserves at the Federal Reserve Bank Forfeited restricted stock Restricted Stock Award, Forfeitures Retained earnings Retained Earnings [Member] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Retirement Plan Type [Domain] Retirement Plan Type [Axis] Service charges Actual Ratio [Abstract] Substandard [Member] Schedule of future amortization expense for amortized intangible assets Highest balance at any month-end Average balance Scenario, Unspecified [Domain] Plan [Member] Deferred tax assets and liabilities Summary of loan activity with officers, directors, stockholders and associates Schedule of Related Party Transactions [Table Text Block] Schedule of Financing Receivables Past Due [Table] Fair value of plan assets Schedule of Allocation of Plan Assets [Table Text Block] Schedule of Financing Receivable, Allowance for Credit Losses [Table] Schedule of gross carrying value and accumulated amortization of intangible assets Computation of earnings per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Financing Receivable, Recorded Investment, Credit Quality Indicator [Table] Reconciliation of statutory tax rates to effective tax rates Unrealized losses and fair value of investments Summary of financing receivables on nonaccrual status Schedule of Financing Receivables, Non Accrual Status [Table Text Block] Weighted-average assumptions used to determine benefit obligations and net periodic benefit cost (income) Condensed financial information Condensed Financial Statements [Table Text Block] Schedule of Financing Receivable, Troubled Debt Restructurings [Table] Borrowed funds Schedule of Debt [Table Text Block] Schedule of vesting, awarding and forfeiting of restricted shares Obligation and net funded status Summary of assets measured at fair value on a recurring basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of Impaired Financing Receivable [Table] Components of net periodic pension cost not yet recognized Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block] Maturities of borrowed funds Schedule of asset acquired and liability assumed Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Future minimum rental payments under operating leases Consolidated condensed quarterly data Quarterly Financial Information [Table Text Block] Provision for income taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Summary of amortized cost and fair value of investment securities Expected future benefit payments Components of net periodic benefit costs Schedule of Net Benefit Costs [Table Text Block] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table] Summarizes the purchase price of branch Summarizes the purchase of FNB Schedule of Available-for-sale Securities [Table] Capital ratios under banking regulations Schedule of Available-for-sale Securities [Line Items] Schedule of Condensed Financial Statements [Table] Components of accumulated other comprehensive loss, net of tax Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Deferred Compensation Arrangement with Individual, Postretirement Benefits [Table] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Fair Value, Off-balance Sheet Risks [Table] Financial instruments whose contract amounts represent credit risk Federal Home Loan Bank loans by branch Schedule of Federal Home Loan Bank, Advances, by Branch of FHLB Bank [Table Text Block] Remaining contractual maturity of the repurchase agreements Schedule of Repurchase Agreements [Table Text Block] Schedule of Related Party Transactions, by Related Party [Table] Property, Plant and Equipment [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Second Mortgage [Member] Total carrying value of collateral pledged Securities Sold under Agreements to Repurchase, Gross Securities Sold Under Agreements to Repurchase [Member] Total liability recognized for repurchase agreements Securities Sold under Agreements to Repurchase Operating Segments Operating Segments [Abstract] Geographical [Domain] MSRs [Member] Additional General Disclosures [Abstract] Forfeited (in dollars per share) Weighted Average Market Price [Roll Forward] Stock awards Share-based compensation expense Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Granted (in dollars per share) Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Outstanding, end of year (in dollars per share) Outstanding, beginning of year (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Vested (in dollars per share) Outstanding, end of year (in shares) Outstanding, beginning of year (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Number of shares available for grant (in shares) Number of shares authorized (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Unvested Shares [Roll Forward] Equity Award [Domain] Equity Award [Domain] Weighted average interest rate paid during the year Special Mention [Member] Standby Letter of Credit [Member] Statement [Line Items] Consolidated Statement of Changes in Stockholders' Equity [Abstract] Geographical [Axis] Consolidated Statement of Cash Flows [Abstract] STATEMENT OF CASH FLOWS [Abstract] Consolidated Statement of Changes in Comprehensive Income [Abstract] Consolidated Balance Sheet [Abstract] CONDENSED BALANCE SHEET [Abstract] Scenario [Axis] Statement [Table] Equity Components [Axis] Dividends that can be declared without the approval of the Comptroller of the Currency Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval Restricted stock vesting Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Restricted stock, executive and Board of Director awards Stock Issued During Period, Value, Restricted Stock Award, Gross Stock issued for acquisition Cash dividend reinvestment paid from treasury stock Stock Issued During Period, Value, Dividend Reinvestment Plan Sale of treasury stock Stock Issued During Period, Value, Treasury Stock Reissued Stock issued for acquisition (in shares) Stock Issued During Period, Shares, Acquisitions Balance Balance TOTAL STOCKHOLDERS' EQUITY Stockholders' equity STOCKHOLDERS' EQUITY: Bank [Member] Supplemental Executive Retirement Plan [Member] Supplemental Employee Retirement Plan [Member] Supplemental Disclosures of Cash Flow Information: Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward [Table] Investment tax credits Tax Credit Carryforward [Axis] Tax Credit Carryforward [Line Items] Tier 1 capital (to risk-weighted assets) Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets Tier 1 capital (to risk-weighted assets) Tier One Risk Based Capital to Risk Weighted Assets Tier 1 capital (to risk-weighted assets) Tier One Risk Based Capital Required for Capital Adequacy Tier 1 capital (to average assets) Tier One Leverage Capital Required to be Well Capitalized to Average Assets Tier 1 capital (to average assets) Tier One Leverage Capital Required for Capital Adequacy to Average Assets Tier 1 capital (to risk-weighted assets) Tier One Risk Based Capital Required to be Well Capitalized Tier 1 capital (to average assets) Tier One Leverage Capital Required for Capital Adequacy Tier 1 capital (to average assets) Tier One Leverage Capital Required to be Well Capitalized Tier 1 capital (to average assets) Tier One Leverage Capital to Average Assets Tier 1 capital (to risk-weighted assets) Tier 1 capital (to average assets) Tier 1 capital (to risk-weighted assets) Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 2020 Time Deposit Maturities, Year Three 2022 Maturities of certificates of deposit [Abstract] Time Deposits, Fiscal Year Maturity [Abstract] Thereafter Total certificates of deposit Time Deposits 2018 Time Deposit Maturities, Next Twelve Months 2021 Time Deposit Maturities, Year Four 2019 Time Deposit Maturities, Year Two Relationship to Entity [Domain] Title of Individual [Axis] Loans Held for Sale Trade and Loan Receivables, Nonmortgage Loans Held-for-sale, Policy [Policy Text Block] Trading securities Trading Securities Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items] Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Table] Types of Financial Instruments [Domain] Treasury stock, at cost: 383,065 and 384,671 shares for 2017 and 2016, respectively Treasury Stock, Value Treasury Stock [Member] Treasury stock, shares (in shares) Purchase of treasury stock (in shares) Purchase of treasury stock Treasury Stock, Value, Acquired, Cost Method Summary of troubled debt restructurings on financing receivables Troubled Debt Restructurings on Financing Receivables [Table Text Block] Type of Adoption [Domain] Loss [Member] Unallocated [Member] Unamortized debt issuance costs Net unamortized loan fees and costs Unrecognized tax benefits Use of Estimates U.S. Agency Securities [Member] U.S. Agency Securities [Member] Obligations of State and Political Subdivisions [Member] US States and Political Subdivisions Debt Securities [Member] U.S. Treasuries [Member] US Treasury Securities [Member] Valuation Technique [Domain] Valuation Technique [Axis] Number of shares used in computation - basic (in shares) Weighted average common shares outstanding (in shares) Weighted average common shares outstanding for basic earnings per share (in shares) Weighted Average [Member] Number of shares used in computation - diluted (in shares) Weighted average common shares outstanding for dilutive earnings per share (in shares) Weighted Average Number of Shares Outstanding, Diluted The balance of financing receivables that were acquired with deteriorated credit quality. Financing Receivable, Loans Acquired With Deteriorated Credit Quality Loans acquired with deteriorated credit quality Amount of credit enhancement for Mortgage Partnership Finance Program Portfolio losses by Federal Home Loan Bank. Federal Home Loan Bank credit enhancement For Mortgage Partnership Finance Program Portfolio losses Credit enhancement for MPF by FHLB Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements, related to Individually evaluated for impairment. Loans and Leases Receivable, Allowance Related to Individually Evaluated For Impairment Allowance for loan losses related to individually evaluated for impairment Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements, related to loans acquired with deteriorated credit quality. Loans and Leases Receivable, Allowance Related to Loans Acquired With Deteriorated Credit Quality Allowance for loan losses related to loans acquired with deteriorated credit quality Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements, related to Individually evaluated for impairment, related to Collectively evaluated for impairment. Loans and Leases Receivable, Allowance Related to Collectively evaluated for impairment Allowance for loan losses related to collectively evaluated for impairment Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. Related to Collectively evaluated for impairment. Loans And Leases Receivable Net Reported Amount Related To Collectively evaluated for impairment Net loans, collectively evaluated for impairment Segments of loan portfolio and allowance for loan losses [Abstract] Portfolio segment of the company's total financing receivables related to construction real estate loans. Construction Real Estate Loans [Member] Construction [Member] Construction [Member] Amount of first loss position maintained by Federal Home Loan Bank under Mortgage Partnership Finance Program. Federal Home Loan Bank, First-loss Position for Mortgage Partnership Finance Program Portfolio First-loss position for MPF maintained by FHLB Real estate loans serviced for Freddie Mac and Fannie Mae, which are not included in the consolidated balance sheet. Real estate loans serviced for Freddie Mac and Fannie Mae Real estate loans serviced for Freddie Mac and Fannie Mae Refers to period of mortgage on residential real estate. Period of mortgage on real estate Period of mortgage on real estate Amount of income tax expense for remeasurement of deferred tax asset from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017. Tax Cuts And Jobs Act Of2017 Change In Tax Rate Deferred Tax Asset Income Tax Expense Net deferred tax asset Advertising Costs [Abstract] Advertising Costs [Abstract] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Income Tax Disclosure [Line Items] Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award. Share-based Payment Award, Fair Value Assumptions, Exercise Price Antidilutive stock share price range (in dollars per share) The number of full service banking offices operated. Number of Full Service Banking Offices Number of full service banking offices Business and Organization [Abstract] Disclosure of information about income taxes. Income Tax Disclosure [Table] Refers to the percentage of benefit in excess of the cash surrender value. Benefit in excess of the cash surrender value Benefit in excess of the cash surrender value Bank Owned Life Insurance [Abstract] Goodwill Impairment [Abstract] Goodwill [Abstract] The number of days past due before a loan is classified as impaired. Number of Days Past Due For Loan to be Considered Impaired Number of days past for loan to be considered impaired Number of days past for loan to be considered impaired, Minimum Allowance for Loan Losses [Abstract] The number of classifications of investment securities, such as Trading, Available-for-sale or Held to Maturity. Number of Classifications of Investment Securities Number of classifications of investment securities The minimum number of days maturity for interest-earning deposits to be considered cash equivalents. Interest earning deposits maturity, Maximum for inclusion as cash equivalents The number of years of historical experience used to determine when to charge off a loan to the reserve. Number of Historical Years of Experience For Charging Off Loans Number of years significantly below cost to recognize an impairment Document and Entity Information [Abstract] Class of financing receivables related to agricultural loans excluding real estate. Other Agricultural Loans [Member] Other Agricultural Loans [Member] Portfolio segment of the entity's total financing receivables related to real estate loans. Real estate loans [Member] Real Estate Loans [Member] Impaired Financing Receivable [Abstract] Impaired Financing Receivable [Abstract] Class of financing receivables related to agricultural real estate loans. Agricultural [Member] Agricultural [Member] Tabular disclosure of the maturities of time deposits (including certificates of deposits, individual retirement accounts and open accounts) held by the entity. Maturities of Time Deposits [Table Text Block] Maturities of certificates of deposit Tabular disclosure of deposit liabilities. Summary of Deposits [Table Text Block] Summary of deposits Indefinite Lived Intangible Assets Net [Abstract] Non-amortized intangible assets [Abstract] Gross Carrying Value Of Intangible Assets And Accumulated Amortization [Abstract] This elements represents face amount of Federal Home Loan Bank Stock per share, generally not indicative of the fair market value per share. Federal Home Loan Bank Stock Par value FHLB Stock, at par value (in dollars per share) Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. Related to Loans acquired with deteriorated credit quality. Loans And Leases Receivable Net Reported Amount Related To Loans Acquired With Deteriorated Credit Quality Net loans, loans acquired with deteriorated credit quality Portfolio segment of the entity's total financing receivables related to state and political subdivision loans. State and political subdivision loans [Member] State and Political Subdivision Loans [Member] Real estate loans sold to Freddie Mac and Fannie Mae without recourse which are not included in the consolidated balance sheet. Real Estate Loans Sold To Freddie Mac And Fannie Mae without recourse Real estate loans sold to Freddie Mac and Fannie Mae without recourse Refers to Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. Related to Individually evaluated for impairment. Loans And Leases Receivable Net Reported Amount Related To Individually evaluated for impairment Net loans, individually evaluated for impairment Refers to the number of plans during the period. Number Of Plans Number of plans Amount of discretionary contributions to 401 (k) plan made by an employer for employees hired after January 1, 2007. Defined Contribution Plan Employer Discretionary Contribution To 401 K Employer discretionary contribution to 401 (k) plan The net amortization and deferral expenses. The net amortization and deferral component is a portion of the benefit obligation and is unaffected by the funded status of the plan. Defined Benefit Plan Net amortization and deferral Net amortization and deferral Represents information about consumer residential mortgages. Consumer Residential Mortgages [Member] Represents amount to be reviewed for all internal and external loan all aggregate loan relationships which are over 30 days past due to ensure the appropriateness of the loan grade. Amount which is 30 days past due to be reviewed for all aggregate loan relationships Amount which is 30 days past due to be reviewed for all aggregate loan relationships Represents amount over which all new loans to be reviewed for all internal and external loan on aggregate basis to ensure the appropriateness of the loan grade. Amount over which all new loans to be reviewed Amount over which all new loans to be reviewed Represents amount over which all relationships to be reviewed for all internal and external loan on aggregate basis to ensure the appropriateness of the loan grade. Amount over which all relationship to be reviewed Amount over which all relationships to be reviewed Financing Receivable by credit exposure [Abstract] Refers to percentage of dollar volume of commercial loan portfolio to be reviewed on annual basis . Percentage of commercial loan portfolio to be reviewed Percentage of dollar volume of commercial loan portfolio to be reviewed Credit quality indicators that are developed and used internally by the company. Internally Assigned Grade 1 [Member] Internally Assigned Grade [Member] Represents purchased credit impaired loan. Purchased Credit Impaired Loan [Member] PCI [Member] Financing receivables on accrual status [Abstract] Recorded investment in financing receivables total that are still accruing. Financing Receivable Recorded Investment Total And Still Accruing Total financing receivables and still accruing Refers to the purchased credit impaired loans that are still accruing. Purchased Credit Impaired Loans And Still Accruing PCI Loans still accruing Financing receivables on nonaccrual status [Abstract] Refers to purchase credit impaired loans that are non accrual. Purchased Credit Impaired Loans, Non accrual PCI Loans considered non accrual Recorded investment in financing receivables that are past due and non accrual. Financing Receivable Recorded Investment Total past Due And Non Accrual Total past due and non-accrual Recorded investment in financing receivables that are current and non accrual. Financing Receivable Recorded Investment Current And Non Accrual Current and non-accrual Elements refers to Purchased credit impaired (PCI) loans. Purchased Credit Impaired Loans PCI Refers to period of past due after which loans are considered as non accrual. Period past due after which loans considered as non accrual Period of past due after which loans considered as non accrual Recorded investment in financing receivables that are current and still accruing. Financing Receivable Recorded Investment Current And Still Accruing Current and still accruing This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents equity securities in financial institutions as of the balance sheet date when have been categorized as available-for-sale. Equity securities in financial institutions fair value disclosure Equity securities in financial institutions This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents U.S. treasury issued debt securities. U.S. treasuries securities Fair Value Disclosure U.S. Treasuries securities This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents mortgage backed securities in government sponsored entities as of the balance sheet date when have been categorized as available-for-sale. Mortgage-backed securities in government sponsored entities fair value disclosure Mortgage-backed securities in government sponsored entities This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents corporate obligations issued debt securities. Corporate obligations Fair Value Disclosure Corporate obligations This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents U.S. agency issued debt securities. U.S. agency securities Fair Value Disclosure U.S. Agency securities This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents bonds or similar securities issued by state, city, province, or local governments or their agencies in either the United States or a foreign country. Debt securities issued by state governments or provinces may include bond issuances of US state or foreign authorities. Debt securities issued by political subdivisions or US states may include debt issuances by county, borough, city, or municipal governments. Obligations of state and political subdivisions fair value disclosure Obligations of state and political subdivisions Fair Value Assets And Liabilities Measured On NonRecurring Basis [Abstract] Fair value assets and liabilities measured on non-recurring basis [Abstract] Fair amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable. Interest Receivable Fair Value Disclosure Accrued interest receivable Refers to consideration period for recognition of cash and due from banks. Consideration period for recognition of cash and due from banks Consideration period for recognition of cash and due from banks Refers to consideration period for recognition of accrued interest receivable and payable. Consideration period for recognition of accrued interest receivable and payable Consideration period for recognition of accrued interest receivable and payable Refers to impaired loans, which may include mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts, or any other loans which are due the as of the balance sheet date. Impaired Loans [Member] Holding period, used as an input to measure fair value. Fair Value Inputs Holding period Holding period Percentage of selling costs, used as an input to measure fair value. Fair Value Inputs Selling costs Selling costs Appraised collateral values valuation technique used to measure fair value. Appraised Collateral Values [Member] Refers to amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts. Other real estate owned [Member] Other Real Estate Owned [Member] The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $250,000 or more. Time Deposits, 250,000 or More Certificates of deposit of $250,000 or more RESTRICTIONS ON CASH AND DUE FROM BANKS [Abstract] Disclosure of accounting policy for cash flows. Cash Flows [Policy Text Block] Cash Flows Disclosure of accounting policy for bank owned life insurance. Bank Owned Life Insurance Policy [Policy Text Block] Bank Owned Life Insurance Disclosure of accounting policy for trust assets and income. Trust Assets and Income [Policy Text Block] Trust Assets and Income Disclosure of accounting policies for treasury stock. Treasury Stock [Policy Text Block] Treasury Stock Disclosure of accounting policy pertaining to change in accounting principal. Change in Accounting Principal, Policy [Policy Text Block] Change in Accounting Principal The period of time securities fair value less than cost for classification as impaired. Duration securities impaired Available For Sale Securities Continuous Unrealized Loss Position Fair Value and unrealized losses [Abstract] Available-For-Sale Securities, Fair Value and Gross Unrealized Losses [Abstract] The number of available-for-sale securities sold for a gross loss during the period. Available for sale Investment Securities Sold at a Gross Loss During the Period Available-for-sale securities sold at a gross loss The number of available-for-sale securities sold for a gross gain during the period. Available for sale Investment Securities Sold at a Gross Gain During the Period Available-for-sale securities sold at a gross gain Financing Receivable Modifications [Abstract] Financing receivable modifications [Abstract] Subsequent Default [Abstract] Recidivism receivables [Abstract] Real estate portfolio segment of the entity related to interest modification. Interest Modification [Member] Real estate portfolio segment of the entity related to term modification. Term Modification [Member] Amount of allowance for credit losses related to recorded investment in financing receivable categorized as troubled debt restructuring. Troubled debt Financing Receivable Related Allowance Reserves of allowance for loan losses Tabular disclosure of accretable yield for purchased credit impaired loans. Accretable Yield For Purchased Credit Impaired Loans [Table Text Block] Accretable yield for purchased credit impaired loans Tabular disclosure of loans acquired with specific evidence of deterioration in credit quality. Loans Acquired With Specific Evidence Of Deterioration In Credit Quality [Table Text Block] Loans acquired with specific evidence of deterioration in credit quality Tabular disclosure of loan portfolio evaluated with individually and collectively impairment and the allowance for loan losses. Schedule of loan portfolio and allowance for loan losses [Table Text Block] Summary of loan portfolio and allowance for loan losses Recorded investment in financing receivables that are past due and still accruing. Financing Receivable Recorded Investment Total Past Due And Still Accruing Total past due and still accruing Amount of interest income that would have been recognized if the financing receivables had performed un accordance with their terms. Impaired Financing Receivable, Foregone Interest Income Foregone interest income Common equity Tier 1 Risk Based equity required for capital adequacy as defined in the regulations. Tier One Risk Based Common Equity Required for Capital Adequacy Common equity Tier 1 capital (to risk weighted assets) For Capital Adequacy Purposes [Abstract] For Capital Adequacy Purposes Amount [Abstract] The number of capital categories during the period. Number of Capital Categories Number of capital categories Refers to Tier 1 common equity divided by risk weighted assets required to be categorized as well capitalized as defined by regulations. Tier One Risk Based Common Equity Required to be Well Capitalized to Risk Weighted Assets Common equity Tier 1 capital (to risk weighted assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio [Abstract] Lending limit due to regulatory regulations. Regulatory Lending Limit Regulatory lending limit Refers to Tier 1 common equity divided by risk weighted assets as defined by regulations. Tier One Risk Based Common Equity to Risk Weighted Assets Common equity Tier 1 capital (to risk weighted assets) Refers to Tier 1 common equity divided by risk weighted assets required for capital adequacy purposes as defined by regulations. Tier One Risk Based Common Equity Required for Capital Adequacy to Risk Weighted Assets Common equity Tier 1 capital (to risk weighted assets) For Capital Adequacy Purposes Ratio [Abstract] Common equity Tier 1 Risk Based equity as defined in the regulations. Tier One Risk Based Common Equity Common equity tier 1 capital (to risk weighted assets) Actual Amount [Abstract] Actual Amount [Abstract] Loans: [Abstract] Loans [Abstract] Common equity Tier 1 Risk Based equity required to be categorized as well capitalized as defined in the regulations. Tier One Risk Based Common Equity Required to be Well Capitalized Common equity Tier 1 capital (to risk weighted assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount [Abstract] The number of preceding years retained net income used for determining the restrictions on dividend declarations. Number of Preceding Years Retained Net Income Used for Restrictions on Dividend Declaration Number of preceding years retained net income used for restrictions on dividend declaration Dividend Restrictions [Abstract] Dividend Restrictions [Abstract] The typical coverage period for credit extension commitments. Coverage Period For Instruments Coverage period for instruments Refers to state name in US Schuylkill County [Member] Refers to state name in US. Berks County [Member] Refers to state name in US Lebanon County [Member] Refers to fair value of specific credit non amortizing. Business Combination Fair Value Specific Credit Non Amortizing Specific credit - non-amortizing Refers to fair value of covenant not to compete. Business Combination Fair Value Covenant Not to Compete Covenant not to compete Refers to mortgage servicing rights. Mortgage Servicing Rights [Member] MSR [Member] Amount of shareholders equity consideration. Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Shareholders Equity The First National Bank of Fredericksburg shareholders' equity Refers to fair value of specific credit amortizing. Business Combination Fair Value Specific Credit Amortizing Specific credit - amortizing Refers to number of branches. Number of Branches Refers to fair value of deferred tax assets. Business Combination Fair Value Deferred Tax Assets Deferred tax assets Amount refers to time deposits. Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed time deposits Time deposits Amount refers to deposits other than time deposits. Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed deposits other than time deposits Deposits other than time deposits Business Combination Consideration in Common Stock [Abstract] Purchase Price Consideration in Common Stock [Abstract] Refers to fair value of other assets. Business Combination Fair Value Other Assets Other assets Refers to fair value of leased premises contracts. Business Combination Fair Value Leased Premises Contracts Leased premises contracts Refers to fair value of premises and equipment. Business Combination Fair Value Premises and Equipment Premises and equipment Amount recognized for assets and liabilities assumed per share. Business Combination Consideration Per Share Merger agreement per share in cash and stock (in dollars per share) Summarizes Purchase of First National Bank of Fredericksburg [Abstract] Summarizes the purchase of FNB [Abstract] Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were granted, as a result off stock dividends during the reporting period. Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Period Increase (Decrease) Weighted Average Grant Date Fair Value Increase due to stock dividends (in dollars per share) A company's investment in its wholly-owned subsidiaries as of the balance sheet date . Investments In Subsidiaries First Citizens Community Bank Includes all dividend income from bank subsidiaries. It may include dividend income from equity securities that do not have readily determinable fair values that are reportable in Other Assets. Dividend Income From Bank Subsidiary Bank subsidiary Amount of undistributed net income or loss for the period from subsidiaries of the parent company. Equity in undistributed Earnings of Subsidiaries Equity in undistributed earnings - First Citizens Community Bank Equity in undistributed earnings of subsidiaries This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, before equity in undistributed earnings of subsidiaries. Income (Loss) Before Equity in Undistributed Earnings of Subsidiaries Income before equity in undistributed earnings of subsidiary One of the ranking officers of the entity, appointed to the position by the board of directors, a director, a stockholder or the any associates of such persons. Officers, Directors, Stockholders and Associates [Member] Officers, Directors, Stockholders and Associates [Member] Amount of reasonable estimate for income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Expense (Benefit) Change in corporate tax rate Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences related to interest income on non-accrual loans. Deferred Tax Assets, Interest on Non accrual Loans Interest on non-accrual loans Amount before allocation of valuation allowances of deferred tax liabilities attributable to deductible temporary differences from unrealized losses on available-for-sale securities. Deferred Tax Liabilities Unrealized Losses On Available for Sale Securities Unrealized gains on available-for-sale securities Amount of deferred income tax expense (benefit) excluding the change in corporate tax rate pertaining to income (loss) from continuing operations. Deferred Income Tax Expense (Benefit) Excluding Change in Corporate Tax Rate Deferred tax The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to nondeductible expenses under enacted tax laws, or differences in the methodologies used to determine expense amounts for financial statements prepared in accordance with generally accepted accounting principles, related to merger and acquisition expense. Income Tax Reconciliation, Nondeductible Merger And Acquisition Expenses Nondeductible merger and acquisition expenses Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from merger and acquisition costs. Deferred Tax Assets Merger and Acquisition costs Merger & acquisition costs Amount of deferred tax asset attributable to taxable temporary differences related to low income housing credits. Deferred Tax Assets Low Income Housing Tax Credits Low income housing tax credits Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from other real estate owned expenses. Deferred Tax Assets, Other real estate owned expenses Other real estate owned The term over which tax credits will be recognized. Tax Credits Recognition term Tax credits recognition period The amount of recognized income tax credits during the period. Recognized Income Tax Credits Tax credits recognized as reduction of tax expense amount The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to the increase in cash surrender value of life insurance. Income Tax Reconciliation Increase In Cash Surrender Value of Life Insurance Bank owned life insurance The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to low income housing credits. Income Tax Reconciliation, Tax Credits, Low Income Housing Low income housing tax credits The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to nondeductible expenses under enacted tax laws, or differences in the methodologies used to determine expense amounts for financial statements prepared in accordance with generally accepted accounting principles, related to interest expense. Income Tax Reconciliation, Nondeductible Expense, Interest Nondeductible interest Represents the number of investments in partnerships as of the Balance Sheet date. Number of Investments in Partnerships Number of investments in partnerships Represents minimum percentages of tax position liable to be realized upon ultimate settlement. Minimum percentages of tax position liable to be realized upon ultimate settlement Minimum percentages of tax position liable to be realized upon ultimate settlement Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from pension benefits and other retirement obligation. Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions and Other Retirement Obligation Pensions and other retirement obligation The percentage rate used to calculate dividend payments. Stock Dividend Rate Percentage Stock dividend percentage An investment that pools funds from many investors to invest in a combination of underlying investments, primarily equity investments. Mutual Funds [Member] Mutual Funds and ETF's [Member] Refers to the acquiree entity name. First National Bank of Fredericksburg [Member] First National Bank of Fredericksburg [Member] Amount refers to bank owned life insurance. Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Bank Owned Life Insurance Bank-owned life insurance The amount of noninterest bearing deposits assumed at the acquisition date. Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Noninterest Bearing Deposits Assumed Noninterest-bearing deposits Payments to purchase Interest-bearing Time Deposits by banks in other financial institutions for relatively short periods of time including, for example, certificates of deposits. Payments To Acquire Interest Bearing Time Deposits In Other Banks Purchase of interest bearing time deposits Amount of interest bearing time deposits with other banks. Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Interest Bearing Time Deposits With Other Banks Interest bearing time deposits with other banks Amount of interest bearing deposits assumed at the acquisition date. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed,, Interest Bearing Deposits Assumed Interest-bearing deposits Acquisition of The First National Bank of Fredericksburg [Abstract] Acquisition of The First National Bank of Fredericksburg The cash outflow to reacquire restricted common stock during the period. Payments for Repurchase of Restricted Stock Purchase of restricted stock The net cash inflow or outflow in Interest-bearing after maturity Deposits by banks in other financial institutions for relatively short periods of time including, for example, certificates of deposits. Proceeds from matured interest bearing time deposits with other banks Represents investments and time deposits sold and not settled included in other assets. Investments Sold And Not Settled Investments sold and not settled included in other assets This represents the amount of expense recognized during the period, that is associated with the defined benefit pension plans. Defined Benefit Plan, Cost Recognized Cost recognized Refers to the plan designed to provide participants with a salary benefit. Excludes other postretirement benefit plans. Salary Continuation Plan [Member] Refers to fair value of time deposits. Business Combination Fair Value Time Deposits Time deposits Business Combination Adjustments To Reflect Liabilities Acquired At Fair Value [Abstract] Adjustments to reflect liabilities acquired at fair value [Abstract] Amount of Loans, interest, PP&E less deposits, interest and escrow payable associated with the acquisition of business during the period. Business Combination, Loans, Interest, PP&E Less Deposits, Interest and Escrow Payable Loans, interest, PP&E less deposits, interest and escrow payable Refers to fair value of general credit. Business Combination Fair Value General Credit General credit Amount refers to accrued interest payable. Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Accrued Interest Payable Accrued interest payable Accrued interest payable Refers to fair value of core deposit intangible. Business Combination Fair Value Core Deposit Intangible Core deposit intangible Refers to fair value of interest rate. Business Combination Fair Value Interest Rate Interest rate Business Combination Fair Value Loans [Abstract] Loans [Abstract] Business Combination Adjustments to Reflect Assets Acquired at Fair Value [Abstract] Adjustments to reflect assets acquired at fair value [Abstract] The amount of deposits as of the acquisition date. Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deposits Deposits Amount refers to loans. Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Loans Loans Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, including Goodwill Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Intangible Assets Including Goodwill Goodwill and other intangibles Amount of interest receivable on loans, acquired at the acquisition date. Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Interest Receivables on Loans Accrued interest receivable Accrued interest receivable Summarizes purchase of Branch [Abstract] Refers to the acquiree entity name. State College Branch [Member] State College Branch [Member] The number of days considered for average deposit balances to pay consideration. Number of Days Considered for Average Deposit Balances Number of days considered for average deposit balances The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable). Business Combination Disclosure of Acquiree [Text Block] ACQUISITION OF STATE COLLEGE BRANCH ACQUISITION OF STATE COLLEGE BRANCH [Abstract] Refers to other real estate expenses (recovery). ORE Expenses Recovery ORE expenses The aggregate expense charged against earnings to allocate the cost of intangible assets (Core deposits and Non Compete) (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. Amortization of Intangible Assets Core Deposits and Non Compete Amortization of intangibles Tax imposed by the Commonwealth of Pennsylvania on the book value of capital stock. Pennsylvania Shares tax Pennsylvania shares tax Maturity period of the day after the reporting date for repurchase agreements and similar transactions, for example, but not limited to, securities lending arrangements. Maturity Overnight and Continuous [Member] Overnight and Continuous [Member] The maturity date of the loan. October 2, 2017 [Member] The maturity date of the loan. July 12, 2021 [Member] The maturity date of the loan. July 12, 2018 [Member] The maturity date of the loan. February42019 [Member] February 4, 2019 [Member] The maturity date of the loan. August 202021 [Member] August 20, 2021 [Member] The maturity date of the loan. January, 06 2022 [Member] January 6, 2022 [Member] The maturity date of the loan. February32021 [Member] February 3, 2021 [Member] The entire disclosure for information about borrowing of funds and repurchase agreement. Borrowed Funds And Repurchase Agreements [Text Block] BORROWED FUNDS AND REPURCHASE AGREEMENTS BORROWED FUNDS AND REPURCHASE AGREEMENTS [Abstract] The pre-tax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Pre Tax Unrecognized pension costs Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act of 2017. Tax Cuts and Jobs Act of 2017, Reclassification from AOCI to Retained Earnings, Tax Effect Reclassification of certain income tax effects from accumulated other comprehensive income Change in other comprehensive income due to change in the federal tax rate The total tax effect of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax Tax effect Accumulated appreciation or loss, pre tax, in value of the total of available-for-sale securities at the end of an accounting period. Accumulated Other Comprehensive Income (Loss), Available for sale Securities Adjustment, Pre Tax Net unrealized gain on securities available for sale Accumulated appreciation or loss, tax, in value of the total of available-for-sale securities at the end of an accounting period. Accumulated Other Comprehensive Income (Loss), Available for sale Securities Adjustment, Tax Tax effect