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Recently Issued Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Jan. 01, 2020
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Dec. 31, 2017
Adoption of ASC 326 $ 6,501          
Adoption of Topic 326 Unfunded Commitments 1,483          
Cumulative effect adjustment to retained earnings   $ 418,246 $ 390,363      
Cumulative effect adjustment to retained earnings   534,195 503,492   $ 448,184 $ 413,284
Retained Earnings [Member]            
Cumulative effect adjustment to retained earnings   $ 418,246 $ 390,363   $ 355,524 $ 317,756
Unfunded Loan Commitment [Member]            
Adoption of Topic 326 Unfunded Commitments 1,500          
Cumulative Effect, Period of Adoption, Adjustment            
Tax impact of cumulative effect adjustment to retained earnings 1,900          
Accounting Standards Update 2016-02 [Member] | Cumulative Effect, Period of Adoption, Adjustment            
Cumulative effect adjustment to retained earnings       $ 722    
Accounting Standards Update 2016-02 [Member] | Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings [Member]            
Cumulative effect adjustment to retained earnings       $ 722    
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment            
Cumulative effect adjustment to retained earnings (6,108)          
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings [Member]            
Cumulative effect adjustment to retained earnings $ (6,108)