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General - Narrative (Details) - USD ($)
$ in Thousands
Jan. 01, 2021
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Retained earnings   $ 755,877 $ 788,578    
Allowance for credit losses - Loans   201,082 [1] 130,648 [1] $ 99,454 $ 80,284
Allowance for credit losses on unfunded loan commitments   20,500 0    
Allowance for credit losses   245 0    
State and municipal          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for credit losses   245 0    
Cumulative effect of ASC 326 adoption          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Retained earnings $ (68,040)        
Percent of increase in allowance 57.00%        
Allowance for credit losses - Loans $ 74,055   74,055    
Life of loan portfolio 4 years        
Allowance for credit losses on unfunded loan commitments $ 20,500 20,500 20,500    
Cumulative effect of ASC 326 adoption | State and municipal          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Allowance for credit losses   $ 245 $ 245    
[1] Beginning January 1, 2021, the calculation is based on the current expected credit loss methodology. Prior to January 1, 2021, the calculation is based on the incurred loss methodology. See additional details in NOTE 1. GENERAL of these Notes to Consolidated Condensed Financial Statement.