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Loans and Allowance for Credit Losses Activity in the Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance $ 291,940 $ 166,209 $ 166,209
Loans charged off 8,202 14,003  
Recoveries of loans previously charged off 2,021 2,887  
Total net (charge-offs) recoveries (6,181) (11,116)  
Provision for credit losses (5,500) 44,029  
Ending balance 280,259 257,471 291,940
Cumulative Effect, Period of Adoption, Adjustment      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 0 58,349 58,349
Ending balance     $ 0
Off-Balance Sheet      
Allowance for Loan and Lease Losses [Roll Forward]      
Provision for credit losses $ 100 $ (3,800)