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Loans and Allowance for Credit Losses on Loans - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance $ 211,866 $ 254,615
Provision for credit losses on loans 19,284 (24,313)
Charge-offs 3,328 11,473
Recoveries 1,191 2,682
Net charge-offs (recoveries) 2,137 8,791
Ending balance 229,013 221,511
Commercial    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 102,202 73,061
Provision for credit losses on loans 16,343 12,035
Charge-offs 2,978 3,863
Recoveries 436 1,358
Net charge-offs (recoveries) 2,542 2,505
Ending balance 116,003 82,591
Energy    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 52,568 84,064
Provision for credit losses on loans (26,500) (23,768)
Charge-offs 0 6,418
Recoveries 755 1,324
Net charge-offs (recoveries) (755) 5,094
Ending balance 26,823 55,202
Mortgage finance    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 6,083 4,699
Provision for credit losses on loans 12,975 352
Charge-offs 0 0
Recoveries 0 0
Net charge-offs (recoveries) 0 0
Ending balance 19,058 5,051
Real estate    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 51,013 92,791
Provision for credit losses on loans 16,466 (12,932)
Charge-offs 350 1,192
Recoveries 0 0
Net charge-offs (recoveries) 350 1,192
Ending balance $ 67,129 $ 78,667