| **Accumulated Other Comprehensive Income (Tables)**            | 9 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 September 30, 2013 and 2012: Accumulated Other Comprehensive Income Unrealized Gains (Losses) on Securities Available for Sale Unrealized Gains (Losses) on Securities Available for Sale for which a Portion of Other-Than-Temporary Impairment has been Recognized in Income Unrealized Gains (Losses) on Cash Flow Hedges Unrealized Gains (Losses) on Defined Benefit Plans TotalBalance at December 31, 2012$17,904 $(3,272) $(2,652) $(17,479) $(5,499)Other comprehensive income before reclassifications(12,646) 89 1,007  (11,550)Amounts reclassified from accumulated other comprehensive income(317)  382 786 851Period change(12,963) 89 1,389 786 (10,699)Balance at September 30, 2013$4,941 $(3,183) $(1,263) $(16,693) $(16,198)                    Balance at December 31, 2011$18,244 $(3,168) $(1,841) $(16,837) $(3,602)Other comprehensive income before reclassifications3,102 (80) (994)  2,028Amounts reclassified from accumulated other comprehensive income(1,387)   940 (447)Period change1,715 (80) (994) 940 1,581Balance at September 30, 2012$19,959 $(3,248) $(2,835) $(15,897) $(2,021)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| Reclassification out of Accumulated Other Comprehensive Income | 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 three and nine months ended September 30, 2013 and 2012: Amount Reclassified from Accumulated Other Comprehensive Income For the Three Months Ended September 30,  Details about Accumulated Other Comprehensive Income Components2013 2012 Affected Line Item in the Statements of IncomeUnrealized gains (losses) on available for sale securities (1)     Realized securities gains reclassified into income $843 Other income - net realized gains on sales of available for sale securitiesRelated income tax expense (294) Income tax expense  $549        Unrealized gains (losses) on cash flow hedges (2)     Interest rate contracts$(207)  Interest expense - subordinated debentures and term loansRelated income tax benefit72  Income tax expense $(135)         Unrealized gains (losses) on defined benefit plans     Amortization of net loss and prior service costs$(112) $(323) Other expenses - salaries and employee benefitsRelated income tax benefit39 113 Income tax expense $(73) $(210)        Total reclassifications for the period, net of tax$(208) $339  Amount Reclassified from Accumulated Other Comprehensive Income For the Nine Months Ended September 30,Details about Accumulated Other Comprehensive Income Components20132012Affected Line Item in the Statements of IncomeUnrealized gains (losses) on available for sale securities (1)Realized securities gains reclassified into income$487$2,134Other income - net realized gains on sales of available for sale securitiesRelated income tax expense(170)(747)Income tax expense$317$1,387Unrealized gains (losses) on cash flow hedges (2)Interest rate contracts$(587)Interest expense - subordinated debentures and term loansRelated income tax benefit205Income tax expense$(382)Unrealized gains (losses) on defined benefit plansAmortization of net loss and prior service costs$(1,209)$(1,446)Other expenses - salaries and employee benefitsRelated income tax benefit423506Income tax expense$(786)$(940)Total reclassifications for the period, net of tax$(851)447(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 3. 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 6. DERIVATIVE FINANCIAL INSTRUMENTS. |

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| - Definition
Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss).
+ References
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=28358780&loc=SL7669686-108580
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