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Allowance for Credit Losses on Off-Balance Sheet Credit Exposures (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2020
Dec. 31, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Provision for credit losses for off-balance sheet credit exposure $ 0 $ 5,000  
Retained earnings   718,090 $ 695,273
Credit loss expense for off-balance sheet credit exposures   $ 29,700  
Cumulative Effect, Period of Adoption, Adjusted Balance      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Provision for credit losses for off-balance sheet credit exposure 3,206    
Cumulative Effect, Period of Adoption, Adjustment      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Provision for credit losses for off-balance sheet credit exposure 3,206    
Retained earnings 8,300    
Accounting Standards Update 2016-13      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Provision for credit losses for off-balance sheet credit exposure 3,200    
Retained earnings 8,300    
Credit loss expense for off-balance sheet credit exposures 3,200    
Accounting Standards Update 2016-13, Effect On Off-Balance Sheet Items      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Retained earnings $ 2,400