Business Segments [Axis] Information Services [Member] Banking Services [Member] Corporate Eliminations and Other [Member] Retirement Plan Type [Axis] Unfunded Supplemental Executive Retirement Plan [Member] Defined Benefit Pension Plan [Member] Class Of Financing Receivable [Axis] Commercial and Industrial [Member] Real Estate Commercial Mortgage [Member] Real Estate Commercial Construction [Member] Other Financing Receivable [Member] Industrial Revenue Bonds [Member] Finite-Lived Intangible Assets By Major Class [Axis] Non-compete Agreements [Member] Customer Lists [Member] Software [Member] Other [Member] Patents [Member] Cash and Cash Equivalents [Axis] State and Political Subdivisions [Member] U.S. government agencies [Member] Certificates of Deposit [Member] Award Type [Axis] Restricted Stock [Member] SARs [Member] Performance-based restricted shares [Member] Credit Exposure Of Loan Portfolio [Axis] Loans Subject To Normal Monitoring [Member] Performing Loans Subject To Special Monitoring [Member] Nonperforming Loans Subject To Special Monitoring [Member] Real Estate Faith-based Mortgage [Member] Real Estate Faith-based Construction [Member] Financial Instrument [Axis] Other Loan [Member] Financing Receivables, Period Past Due [Axis] Current [Member] 30 to 59 Days Past Due [Member] 60 to 89 Days Past Due [Member] 90 Days and Over [Member] Range [Axis] Minimum [Member] Maximum [Member] Subsequent Event Type [Axis] Subsequent Event [Member] Document and Entity Information [Abstract] Document Type Amendment Flag Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Common Stock, Shares Outstanding Statement of Financial Position [Abstract] Assets Cash and due from banks Interest-bearing deposits in other financial institutions Federal funds sold and other short-term investments Cash and cash equivalents Securities available-for-sale, at fair value Loans Less: Allowance for loan losses Loans, net Premises and equipment, net Investment in bank-owned life insurance Payments in excess of funding Goodwill Other intangible assets, net Other assets Total assets Liabilities and Shareholders' Equity Liabilities: Deposits: Noninterest-bearing Interest-bearing Total deposits Accounts and drafts payable Other liabilities Total liabilities Shareholders' Equity: Preferred stock, par value $.50 per share; 2,000,000 shares authorized and no shares issued Common stock, par value $.50 per share; 40,000,000 shares authorized and 13,047,997 shares issued at September 30, 2018 and December 31, 2017 Additional paid-in capital Retained earnings Common shares in treasury, at cost (746,260 shares at September 30, 2018 and 760,962 shares at December 31, 2017) Accumulated other comprehensive loss Total shareholders' equity Total liabilities and shareholders' equity Preferred stock, par value per share Preferred stock, shares authorized Preferred stock, shares issued Common stock, par value per share Common stock, shares authorized Common stock, shares issued Treasury stock, shares Income Statement [Abstract] Fee Revenue and Other Income: Information services payment and processing revenue Bank service fees Losses on sales of securities Other Total fee revenue and other income Interest Income: Interest and fees on loans Interest and dividends on securities: Taxable Exempt from federal income taxes Interest on federal funds sold and other short-term investments Total interest income Interest Expense: Interest on deposits Net interest income Provision for loan losses Net interest income after provision for loan losses Total net revenue Operating Expense: Personnel Occupancy Equipment Amortization of intangible assets Other operating expense Total operating expense Income before income tax expense Income tax expense Net income Basic earnings per share Diluted earnings per share Statement of Comprehensive Income [Abstract] Comprehensive income: Net income Other comprehensive income: Net unrealized (loss) gain on securities available-for-sale Tax effect Reclassification adjustments for losses included in net income Tax effect Foreign currency translation adjustments Total comprehensive income Statement of Cash Flows [Abstract] Cash Flows From Operating Activities: Adjustments to reconcile net income to net cash provided by operating activities: Depreciation and amortization Net losses on sales of securities Stock-based compensation expense Increase in income tax liability Increase in pension liability Decrease (increase) in accounts receivable Other operating activities, net Net cash provided by operating activities Cash Flows From Investing Activities: Proceeds from sales of securities available-for-sale Proceeds from maturities of securities available-for-sale Purchase of securities available-for-sale Net (increase) decrease in loans Net increase in payments in excess of funding Purchases of premises and equipment, net Net cash used in investing activities Cash Flows From Financing Activities: Net decrease in noninterest-bearing demand deposits Net decrease in interest-bearing demand and savings deposits Net increase (decrease) in time deposits Net increase in accounts and drafts payable Cash dividends paid Purchase of common shares for treasury Other financing activities, net Net cash (used in) provided by financing activities Net decrease in cash and cash equivalents Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Supplemental information: Cash paid for interest Cash paid for income taxes Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Goodwill and Intangible Assets Disclosure [Abstract] Intangible Assets Earnings Per Share [Abstract] Earnings Per Share Equity [Abstract] Stock Repurchases Segment Reporting [Abstract] Industry Segment Information Receivables [Abstract] Loans by Type Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Stock-Based Compensation Retirement Benefits [Abstract] Defined Pension Plans Income Tax Disclosure [Abstract] Income Taxes Investments, Debt and Equity Securities [Abstract] Investment in Securities Fair Value Disclosures [Abstract] Fair Value of Financial Instruments Subsequent Events [Abstract] Subsequent Events Schedule of Company's Intangible Assets Schedule of Earnings Per Share Summary of Company's Operations in Each Segment Summary of Loan Categories Schedule of the Aging Loans by Loan Categories Schedule of Credit Exposure of the Loan Portfolio Schedule of Recorded Investment and Unpaid Principal Balance for Impaired Loans Summary of the Allowance for Loan Losses Summary of Contractual Cash Obligation of Operating Lease Commitments Summary of Restricted Stock Activity Summary of SARs Activity Summary of Non-vested SARs Activity Schedule of Assumptions used in SARs Granted Schedule of Net Periodic Pension Costs Schedule of Unfunded Supplemental Executive Retirement Plan Schedule of Investment Securities Schedule of the Fair Value of Securities with Unrealized Losses Schedule of Amortized Cost and Fair Value of Investment Summary of the Fair Value of Financial Instruments Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets by Major Class [Axis] Goodwill [Member] Intangible assets amortization period 2018 2019 2020 2021 2022 Recorded intangible assets Assets eligible for amortization: Gross Carrying Amount Accumulated Amortization Unamortized intangible assets: Goodwill, Gross Carrying Amount Goodwill, Accumulated Amortization Total intangible assets Accumulated Amortization Basic: Weighted-average common shares outstanding Diluted: Net Income Effect of dilutive restricted stock and stock appreciation rights Weighted-average common shares outstanding assuming dilution Number of shares authorized to be repurchased Shares repurchased Remaining number of shares available for repurchase Schedule of Segment Reporting Information, by Segment [Table] Segment Reporting Information [Line Items] Segments [Axis] Fee revenue and other income: Fee income from customers Interest income Interest expense Intersegment income (expense) Tax-equivalized pre-tax income Other intangible assets, net Total assets Funding Sources Participating Mortgage Loans [Table] Participating Mortgage Loans [Line Items] Loans Class of Financing Receivable, Type [Axis] Current Past due Nonaccrual Beginning Balance Charge-Offs Recoveries Provision Ending Balance Unused loan commitments Standby letters of credit Commercial letters of credit Operating lease commitments, Less than 1 Year Operating lease commitments, 1 to 3 Years Operating lease commitments, 3 to 5 Years Operating lease commitments, Over 5 Years Operating lease commitments, Total Time Deposits, Less than 1 Year Time Deposits, 1 to 3 Years Time Deposits, 3 to 5 Years Time Deposits, over 5 Years Time Deposits, Total Commitments, Less than 1 Year Commitments, 1 to 3 Years Commitments, 3 to 5 Years Commitments, Over 5 Years Commitments, Total Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Equity Incentive Plan, shares authorized Unrecognized compensation cost Total unrecognized compensation expense, weighted average period Vesting period Granted, Shares Percentage of target opportunity for awards to vest Fair value of granted shares per share Expense incurred to grant shares Expiry period Shares Beginning balance Granted Vested Forfeited Ending balance Fair Value Beginning balance Granted Vested Forfeited Ending balance Exercised Exercisable Outstanding, Weighted Average Exercise Price Exercised, Weighted Average Exercise Price Outstanding, Weighted Average Exercise Price Exercisable, Weighted Average Exercise Price Outstanding, Average Remaining Contractual Term Years Exercisable, Average Remaining Contractual Term Years Outstanding, Aggregate Intrinsic Value Outstanding, Aggregate Intrinsic Value Exercisable, Aggregate Intrinsic Value Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan Disclosure [Line Items] Pension costs Pension contribution Pension period Service cost - benefits earned during the year Interest cost on projected benefit obligations Expected return on plan assets Net amortization and deferral Net periodic pension cost Income Tax Contingency [Table] Income Tax Contingency [Line Items] Adjustments for New Accounting Pronouncements [Axis] Accounting Standards Update 2016-09 [Member] Statutory federal tax rate Net operating loss carryforward1 Limitations on use Unrecognized tax benefits Amounts of tax benefits that would affect effective tax rate if recognized Income tax accrued interest Income tax penalties accrued Prior year income tax interest expense Statute of limitations Reduction in income tax expense from adoption of ASU No. 2016-09 - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting Number of securities that had an unrealized loss Number of securities that had an unrealized loss, greater than 12 months Percentage of total securities Gross realized gains Securities pledged as collateral Investment [Table] Investment [Line Items] Fair Value Gross Unrealized Gains Gross Unrealized Losses Amortized Cost Estimated fair value, less than 12 months Estimated fair value, 12 months or more Estimated fair value, total Unrealized losses, less than 12 months Unrealized losses, 12 months or more Unrealized losses, total Amortized Cost, Due in 1 year or less Amortized Cost, Due after 1 year through 5 years Amortized Cost, Due after 5 years through 10 years Amortized Cost, Due after 10 years Amortized Cost, Total Fair Value, Due in 1 year or less Fair Value, Due after 1 year through 5 years Fair Value, Due after 5 years through 10 years Fair Value, Due after 10 years Fair Value, Total Cash and cash equivalents, Carrying Amount Investment securities, Carrying Amount Loans, net, Carrying Amount Accrued interest receivable, Carrying Amount Assets, Carrying Amount Cash and cash equivalents, Fair Value Investment securities, Fair Value Loans, net, Fair Value Accrued interest receivable, Fair Value Assets, Fair Value Deposits, Carrying Amount Accounts and drafts payable, Carrying Amount Accrued interest payable, Carrying Amount Liabilities, Carrying Amount Deposits, Fair Value Accounts and drafts payable, Fair Value Accrued interest payable, Fair Value Liabilities, Fair Value Statement [Table] Statement [Line Items] Percentage of common stock dividend payable Dividend per share Date of dividend payable Additional share of common stock received on unit Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business and includes carrying value of amounts due on drafts payable on the balance sheet date. 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 the amount of accounts and drafts payable existing as of the balance sheet date. Additional share of common stock received on per unit. This element represents the aggregate of the assets reported at period end of carrying value. The percentage of the number of investment positions in the available-for-sale investments determined to be temporarily impaired. Banking Services [Member] Commercial And Industrial Loan The percentage of common stock dividend payable. Corporate Eliminations and Other [Member] Credit exposure Of Loan Portfolio [Domain] Credit Exposure Of Loan Portfolio [Domain] Defined Benefit Plan, Pension Period Document And Entity Information Federal funds sold and other short term investments. Amount of income from customers after provision for loan loss. Net change during the reporting period in the carrying amount of accounts and drafts payable. Net change during the reporting period in interest-bearing demand and savings deposits. Net change during the reporting period in noninterest-bearing demand deposits. Net change during the reporting period in the carrying amount of payments in excess of funding. Industrial Revenue Bond [Member] Information Services [Member] Revenue earned from providing services relating to transportation invoice rating, payment, audit, accounting and transportation information to many of the nation's largest companies. Intangible Assets, Accumulated Amortization Interest income on federal funds sold and other short-term investments. Amount of intersegment income expense after provision for loan loss. This element represents the aggregate of the liabilities reported on the carrying value of the entity. Loans Subject To Normal Monitoring [Member] Nonperforming Loans Subject To Special Monitoring [Member] Other Financing Receivable [Member] Other Loan The normal cycle for payment of Transportation invoices to a carrier, on behalf of the company's customer, is: the customer provides the funds to the company prior to the payment of the invoice by the company to the carrier. Payments in excess of funding are generated when, according to a service agreement with a few selected carriers, the company pays the carrier prior to receipt of the funds from the customer. The company receives a fee from the carrier for making this accelerated payment. Percentage of target opportunity for awards to vest. Performance based Restricted Shares [Member] Performing Loans Subject To Special Monitoring [Member] Real Estate Church Related Construction Loan Real Estate Church Related Mortgage Real Estate Commercial Construction Loan Real Estate Commercial Mortgage Recorded Investment [Member] The amount of reduction in accrued interest resulting from settlements with taxing authorities and other prior year adjustments. Reduction in income tax expense from adoption of ASU No. 2016-09 – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. Tabular disclosure for credit exposure of loan portfolio by internally assigned credit grade. Tabular disclosure for loan categories. The weighted average period between the balance sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years. The weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years. Standby letters of credit outstanding. Unamortized Intangible Asset Upaid Principal Balance [Member] Bank service fees. Funding sources. Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business and includes carrying value of amounts due on drafts payable on the balance sheet date. Real Estate Faith-based Mortgage [Member] Real Estate Faith-based Construction [Member] Intangible Assets, Net (Excluding Goodwill) Liabilities Treasury Stock, Value Stockholders' Equity Attributable to Parent Liabilities and Equity Noninterest Income Interest and Dividend Income, Operating Interest Income (Expense), Net Interest Income (Expense), after Provision for Loan Loss Revenues Noninterest Expense Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Comprehensive Income (Loss), Net of Tax, Attributable to Parent Increase (Decrease) in Accounts Receivable Net Cash Provided by (Used in) Operating Activities Payments to Acquire Available-for-sale Securities Payments for (Proceeds from) Loans and Leases (Increase) Decrease In Payments In Excess Of Funding Payments to Acquire Property, Plant, and Equipment Net Cash Provided by (Used in) Investing Activities Increase (Decrease) In Accounts and Drafts Payable Payments of Ordinary Dividends, Common Stock Payments for Repurchase of Common Stock Net Cash Provided by (Used in) Financing Activities Cash and Cash Equivalents, Period Increase (Decrease) Finite-Lived Intangible Assets, Accumulated Amortization Goodwill, Impaired, Accumulated Impairment Loss Intangible Assets Accumulated Amortization Weighted Average Number of Shares Outstanding, Diluted Notes, Loans and Financing Receivable, Net, Current Operating Leases, Future Minimum Payments Due Time Deposits Other Commitment Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Defined Benefit Plan, Expected Return (Loss) on Plan Assets Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Available-for-sale Securities, Amortized Cost Basis Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Debt Securities, Available-for-sale, Amortized Cost Assets Carrying Amount Assets, Fair Value Disclosure Liabilities Carrying Value Financial and Nonfinancial Liabilities, Fair Value Disclosure