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Loans, Allowance for Credit Losses, and Asset Quality Information - Unfunded Loan Commitments (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 52,388 $ 21,398 $ 21,398
Charge-offs (2,317) (3,313) (8,502)
Recoveries 1,203 823 4,453
Provisions 0 5,590 35,039
Ending balance 65,849 $ 24,498 52,388
Cumulative Effect, Period Of Adoption, Adjustment      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 14,575    
Ending balance     14,575
Unfunded Loan Commitment      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance 582    
Charge-offs 0    
Recoveries 0    
Provisions 0    
Ending balance 8,086   582
Unfunded Loan Commitment | Cumulative Effect, Period Of Adoption, Adjustment      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning balance $ 7,504    
Ending balance     $ 7,504