|**Income Tax (Tables)**                                                                           | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
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|**Income Tax Disclosure [Abstract]**                                                              |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Schedule of differences between income taxes at federal statutory tax rate and effective tax rate | The following table summarizes the major components creating differences between income taxes at the federal statutory and the effective tax rate recorded in the consolidated statements of income for thethree months ended March 31, 2020and2019:Three Months EndedMarch 31,20202019Reconciliation of Federal Statutory to Actual Tax Expense:Federal statutory income tax at 21%$7,928$9,609Tax-exempt interest income(3,022)(2,267)Share-based compensation—(350)Tax-exempt earnings and gains on life insurance(286)(207)Tax credits(61)(78)CARES Act - NOL carryback rate differential(1,178)—Other109234Actual Tax Expense$3,490$6,941Effective Tax Rate9.2%15.2%
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|                                                                                                  | Three Months EndedMarch 31,                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
|                                                                                                  | 2020                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Reconciliation of Federal Statutory to Actual Tax Expense:                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Federal statutory income tax at 21%                                                               | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Tax-exempt interest income                                                                        | (3,022                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Share-based compensation                                                                          | —                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Tax-exempt earnings and gains on life insurance                                                   | (286                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
|Tax credits                                                                                       | (61                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|CARES Act - NOL carryback rate differential                                                       | (1,178                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Other                                                                                             | 109                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Actual Tax Expense                                                                                | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
|Effective Tax Rate                                                                                | 9.2                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      

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