v3.26.3
Loans and Allowance for Credit Losses on Loans - Allowance Activity (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance $ 270,557 $ 271,709 $ 271,709
Provision for credit losses on loans 47,755 38,819  
Charge-offs 49,436 37,942 52,883
Recoveries 1,457 1,440  
Net charge-offs (recoveries) 47,979 36,502  
Ending balance 270,333 274,026 270,557
Commercial      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 202,029 198,423 198,423
Provision for credit losses on loans 74,869 35,106  
Charge-offs 42,338 37,011  
Recoveries 1,266 1,019  
Net charge-offs (recoveries) 41,072 35,992  
Ending balance 235,826 197,537 202,029
Mortgage finance      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 6,221 2,755 2,755
Provision for credit losses on loans (2,837) 5,944  
Charge-offs 0 0  
Recoveries 0 0  
Net charge-offs (recoveries) 0 0  
Ending balance 3,384 8,699 6,221
Commercial real estate      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 60,559 68,825 68,825
Provision for credit losses on loans (24,286) (2,306)  
Charge-offs 7,098 931  
Recoveries 184 413  
Net charge-offs (recoveries) 6,914 518  
Ending balance 29,359 66,001 60,559
Consumer      
Allowance for Loan and Lease Losses [Roll Forward]      
Beginning balance 1,748 1,706 1,706
Provision for credit losses on loans 9 75  
Charge-offs 0 0  
Recoveries 7 8  
Net charge-offs (recoveries) (7) (8)  
Ending balance $ 1,764 $ 1,789 $ 1,748