| **Accumulated Other Comprehensive Income (Loss) (Tables)**            | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
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| **Equity [Abstract]**                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Schedule of Accumulated Other Comprehensive Income (Loss)             | The following table summarizes the changes in the balances of each component of accumulated other comprehensive income (loss), net of tax, as of December 31, 2016 and 2015:Accumulated Other Comprehensive Income (Loss)Unrealized Gains (Losses) on Securities Available for SaleUnrealized Gains (Losses) on Cash Flow HedgesUnrealized Gains (Losses) on Defined Benefit PlansTotalBalance at December 31, 2015$12,325$(2,347)$(11,340)$(1,362)Other comprehensive income before reclassifications(9,087)(240)(470)(9,797)Amounts reclassified from accumulated other comprehensive income(2,203)813(1,032)(2,422)Period change(11,290)573(1,502)(12,219)Balance at December 31, 2016$1,035$(1,774)$(12,842)$(13,581)Balance at December 31, 2014$14,098$(2,182)$(13,546)$(1,630)Other comprehensive income before reclassifications(37)(1,093)2,4041,274Amounts reclassified from accumulated other comprehensive income(1,736)928(198)(1,006)Period change(1,773)(165)2,206268Balance at December 31, 2015$12,325$(2,347)$(11,340)$(1,362)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
| Reclassification out of Accumulated Other Comprehensive Income (Loss) | The following table presents the reclassification adjustments out of accumulated other comprehensive income (loss) that were included in net income in the Consolidated Condensed Statements of Income for the years ended December 31, 2016, 2015 and 2014:Amount Reclassified from Accumulated Other Comprehensive Income (Loss) For the Year Ended December 31,Details about Accumulated Other Comprehensive Income (Loss) Components201620152014Affected Line Item in the Statements of IncomeUnrealized gains (losses) on available for sale securities (1)Realized securities gains reclassified into income$3,389$2,670$3,581Other income - net realized gains on sales of available for sale securitiesRelated income tax expense(1,186)(934)(1,253)Income tax expense$2,203$1,736$2,328Unrealized gains (losses) on cash flow hedges (2)Interest rate contracts$(1,250)$(1,427)$(1,411)Interest expense - subordinated debentures and term loansRelated income tax benefit437499493Income tax expense$(813)$(928)$(918)Unrealized gains (losses) on defined benefit plansAmortization of net loss and prior service costs$1,588$305$520Other expenses - salaries and employee benefitsRelated income tax benefit (expense)(556)(107)(182)Income tax expense$1,032$198$338Total reclassifications for the period, net of tax$2,422$1,0061,748(1)  For additional detail related to unrealized gains (losses) on available for sale securities and related amounts reclassified from accumulated        other comprehensive income see Note 4. INVESTMENT SECURITIES.(2)  For additional detail related to unrealized gains (losses) on cash flow hedges and related amounts reclassified from accumulated other comprehensive income see Note 13. DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES. |

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| - References
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| - Definition
Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss).
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No definition available.
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| - Definition
Tabular disclosure of the components of accumulated other comprehensive income (loss).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580
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