|**Accumulated Other Comprehensive Income (Loss) (Tables)**             | 3 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 March 31, 2022 and 2021: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, 2021$59,774$(660)$(4,001)$55,113Other comprehensive income (loss) before reclassifications(139,487)239—(139,248)Amounts reclassified from accumulated other comprehensive income(447)190—(257)Period change(139,934)429—(139,505)Balance at March 31, 2022$(80,160)$(231)$(4,001)$(84,392)Balance at December 31, 2020$87,988$(1,594)$(11,558)$74,836Other comprehensive income (loss) before reclassifications(37,850)46—(37,804)Amounts reclassified from accumulated other comprehensive income(1,421)199—(1,222)Period change(39,271)245—(39,026)Balance at March 31, 2021$48,717$(1,349)$(11,558)$35,810                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
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|                                                                       | Accumulated Other Comprehensive Income (Loss)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|                                                                       | Unrealized Gains (Losses) on Securities Available for Sale                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Balance at December 31, 2021                                           | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Other comprehensive income (loss) before reclassifications             | (139,487)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Amounts reclassified from accumulated other comprehensive income       | (447)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Period change                                                          | (139,934)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
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|Balance at March 31, 2022                                              | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
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|Balance at December 31, 2020                                           | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|Other comprehensive income (loss) before reclassifications             | (37,850)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
|Amounts reclassified from accumulated other comprehensive income       | (1,421)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Period change                                                          | (39,271)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
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|Balance at March 31, 2021                                              | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|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 three months ended March 31, 2022 and 2021.Amount Reclassified from Accumulated Other Comprehensive Income (Loss) For the Three Months Ended March 31,Details about Accumulated Other Comprehensive Income (Loss) Components20222021Affected Line Item in the Statements of IncomeUnrealized gains (losses) on available for sale securities(1)Realized securities gains reclassified into income$566$1,799Other income - net realized gains on sales of available for sale securitiesRelated income tax expense(119)(378)Income tax expense$447$1,421Unrealized gains (losses) on cash flow hedges(2)Interest rate contracts$(241)$(252)Interest expense - subordinated debentures and term loansRelated income tax benefit5153Income tax expense$(190)$(199)Total reclassifications for the period, net of tax$257$1,222(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 of these Notes to Consolidated Condensed Financial Statements.(2)For additional detail related to unrealized gains (losses) on cash flow hedges and related amounts reclassified from accumulated other comprehensive income see NOTE 7. DERIVATIVE FINANCIAL INSTRUMENTS of these Notes to Consolidated Condensed Financial Statements.
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|Details about Accumulated Other Comprehensive Income (Loss) Components |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Unrealized gains (losses) on available for sale securities(1)          |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Realized securities gains reclassified into income                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
|Related income tax expense                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
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|Unrealized gains (losses) on cash flow hedges(2)                       |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
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|Related income tax benefit                                             |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
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|Total reclassifications for the period, net of tax                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
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