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Loans and Allowance for Credit Losses Activity in the Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance $ 269,805 $ 272,920 $ 291,940 $ 166,209 $ 166,209
Loans charged off 2,234 5,489 19,958 27,539  
Recoveries of loans previously charged off 4,539 7,847 9,128 14,660  
Total net (charge-offs) recoveries 2,305 2,358 (10,830) (12,879)  
Provision for credit losses (600) 7,080 (9,600) 70,680  
Ending balance 271,510 282,358 271,510 282,358 291,940
Cumulative Effect, Period of Adoption, Adjustment          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 0 0 0 58,348 58,348
Ending balance         0
Off-Balance Sheet          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance       12,600 $ 12,600
Provision for credit losses $ 10 $ 850 $ 410 $ 320