v3.26.3
Allowance for Credit Losses - Schedule of Activity in the Allowance for Credit Losses by Loan Portfolio (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance for credit losses at beginning of period $ 480,969 $ 457,063 $ 460,205 $ 436,603
Other adjustments (18) (88) (158) 96
Charge-offs (27,174) (28,846) (68,105) (64,790)
Recoveries 6,177 4,291 15,244 14,255
Provision for credit losses 25,886 21,771 78,654 68,027
Allowance for credit losses at period end 485,840 454,191 485,840 454,191
Individually measured 23,220 39,498 23,220 39,498
Collectively measured 462,620 414,693 462,620 414,693
Individually measured 125,970 124,966 125,970 124,966
Collectively measured 56,532,851 51,808,923 56,532,851 51,808,923
Loans held at fair value 145,750 129,593 145,750 129,593
Commercial        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance for credit losses at beginning of period 234,809 194,568 178,545 175,837
Other adjustments 0 0 0 0
Charge-offs (19,075) (21,597) (38,340) (37,467)
Recoveries 1,577 1,449 4,706 4,124
Provision for credit losses 22,823 15,056 95,223 46,982
Allowance for credit losses at period end 240,134 189,476 240,134 189,476
Individually measured 23,091 29,747 23,091 29,747
Collectively measured 217,043 159,729 217,043 159,729
Individually measured 85,670 66,576 85,670 66,576
Collectively measured 18,256,095 16,477,766 18,256,095 16,477,766
Loans held at fair value 0 0 0 0
Commercial Real Estate        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance for credit losses at beginning of period 209,948 224,358 246,933 222,856
Other adjustments 0 0 0 0
Charge-offs (414) (144) (8,381) (6,309)
Recoveries 2,103 241 2,114 263
Provision for credit losses (2,564) 6,022 (31,593) 13,667
Allowance for credit losses at period end 209,073 230,477 209,073 230,477
Individually measured 81 9,688 81 9,688
Collectively measured 208,992 220,789 208,992 220,789
Individually measured 13,013 28,203 13,013 28,203
Collectively measured 14,947,598 13,591,004 14,947,598 13,591,004
Loans held at fair value 0 0 0 0
Home  Equity        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance for credit losses at beginning of period 10,004 9,221 10,402 8,943
Other adjustments 0 0 0 0
Charge-offs 0 (27) 0 (138)
Recoveries 12 104 331 350
Provision for credit losses (179) (69) (896) 74
Allowance for credit losses at period end 9,837 9,229 9,837 9,229
Individually measured 0 0 0 0
Collectively measured 9,837 9,229 9,837 9,229
Individually measured 1,149 1,295 1,149 1,295
Collectively measured 506,682 482,907 506,682 482,907
Loans held at fair value 0 0 0 0
Residential Real Estate        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance for credit losses at beginning of period 13,257 11,455 12,519 10,335
Other adjustments 0 0 0 0
Charge-offs (107) (26) (620) (26)
Recoveries 24 1 26 139
Provision for credit losses 445 583 1,694 1,565
Allowance for credit losses at period end 13,619 12,013 13,619 12,013
Individually measured 47 60 47 60
Collectively measured 13,572 11,953 13,572 11,953
Individually measured 26,111 28,854 26,111 28,854
Collectively measured 4,524,154 3,985,423 4,524,154 3,985,423
Loans held at fair value 145,750 129,593 145,750 129,593
Premium Finance Receivables        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance for credit losses at beginning of period 11,952 16,612 11,011 17,820
Other adjustments (18) (88) (158) 96
Charge-offs (7,361) (6,878) (20,195) (20,350)
Recoveries 2,435 2,459 7,948 9,281
Provision for credit losses 5,321 (156) 13,723 5,102
Allowance for credit losses at period end 12,329 11,949 12,329 11,949
Individually measured 0 0 0 0
Collectively measured 12,329 11,949 12,329 11,949
Individually measured 0 0 0 0
Collectively measured 18,163,185 17,124,845 18,163,185 17,124,845
Loans held at fair value 0 0 0 0
Consumer and Other        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance for credit losses at beginning of period 999 849 795 812
Other adjustments 0 0 0 0
Charge-offs (217) (174) (569) (500)
Recoveries 26 37 119 98
Provision for credit losses 40 335 503 637
Allowance for credit losses at period end 848 1,047 848 1,047
Individually measured 1 3 1 3
Collectively measured 847 1,044 847 1,044
Individually measured 27 38 27 38
Collectively measured 135,137 146,978 135,137 146,978
Loans held at fair value $ 0 $ 0 $ 0 $ 0