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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, 2022
Mar. 31, 2021
Dec. 31, 2021
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance $ 263,534 $ 291,940 $ 291,940
Loans charged off 1,900 8,202  
Recoveries of loans previously charged off 2,954 2,021  
Total net (charge-offs) recoveries 1,054 (6,181)  
Provision for credit losses (6,950) (5,500)  
Ending balance 257,638 280,259 263,534
ACL - loans 243,705   $ 249,001
Off-Balance Sheet      
Allowance for Loan and Lease Losses [Roll Forward]      
Provision for credit losses (600) (100)  
ACL - loans $ 13,900 $ 14,300