v3.26.1
Allowance for Credit Losses - Schedule of Activity in the Allowance for Credit Losses by Loan Portfolio (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance for credit losses at beginning of period $ 471,334 $ 447,941 $ 460,205 $ 436,603
Other adjustments (90) 180 (140) 184
Charge-offs (17,282) (18,495) (40,931) (35,944)
Recoveries 3,836 5,155 9,067 9,964
Provision for credit losses 23,171 22,282 52,768 46,256
Allowance for credit losses at period end 480,969 457,063 480,969 457,063
Individually measured 31,654 43,363 31,654 43,363
Collectively measured 449,315 413,700 449,315 413,700
Individually measured 134,955 143,486 134,955 143,486
Collectively measured 55,382,319 50,761,309 55,382,319 50,761,309
Loans held at fair value 137,673 136,884 137,673 136,884
Commercial        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance for credit losses at beginning of period 210,959 201,183 178,545 175,837
Other adjustments 0 0 0 0
Charge-offs (10,837) (6,148) (19,265) (15,870)
Recoveries 1,710 1,746 3,129 2,675
Provision for credit losses 32,977 (2,213) 72,400 31,926
Allowance for credit losses at period end 234,809 194,568 234,809 194,568
Individually measured 29,418 35,129 29,418 35,129
Collectively measured 205,391 159,439 205,391 159,439
Individually measured 90,642 80,877 90,642 80,877
Collectively measured 18,190,669 16,306,554 18,190,669 16,306,554
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 224,870 210,010 246,933 222,856
Other adjustments 0 0 0 0
Charge-offs (707) (5,711) (7,967) (6,165)
Recoveries 5 10 11 22
Provision for credit losses (14,220) 20,049 (29,029) 7,645
Allowance for credit losses at period end 209,948 224,358 209,948 224,358
Individually measured 2,111 8,127 2,111 8,127
Collectively measured 207,837 216,231 207,837 216,231
Individually measured 17,220 32,828 17,220 32,828
Collectively measured 14,253,387 13,259,182 14,253,387 13,259,182
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 10,213 9,139 10,402 8,943
Other adjustments 0 0 0 0
Charge-offs 0 (111) 0 (111)
Recoveries 16 30 319 246
Provision for credit losses (225) 163 (717) 143
Allowance for credit losses at period end 10,004 9,221 10,004 9,221
Individually measured 0 0 0 0
Collectively measured 10,004 9,221 10,004 9,221
Individually measured 1,177 1,780 1,177 1,780
Collectively measured 490,605 465,035 490,605 465,035
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 13,081 10,652 12,519 10,335
Other adjustments 0 0 0 0
Charge-offs (163) 0 (513) 0
Recoveries 1 2 2 138
Provision for credit losses 338 801 1,249 982
Allowance for credit losses at period end 13,257 11,455 13,257 11,455
Individually measured 119 103 119 103
Collectively measured 13,138 11,352 13,138 11,352
Individually measured 25,803 27,960 25,803 27,960
Collectively measured 4,379,216 3,783,938 4,379,216 3,783,938
Loans held at fair value 137,673 136,884 137,673 136,884
Premium Finance Receivables        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Allowance for credit losses at beginning of period 11,391 16,039 11,011 17,820
Other adjustments (90) 180 (140) 184
Charge-offs (5,403) (6,346) (12,834) (13,472)
Recoveries 2,076 3,335 5,513 6,822
Provision for credit losses 3,978 3,404 8,402 5,258
Allowance for credit losses at period end 11,952 16,612 11,952 16,612
Individually measured 0 0 0 0
Collectively measured 11,952 16,612 11,952 16,612
Individually measured 0 0 0 0
Collectively measured 17,924,544 16,830,136 17,924,544 16,830,136
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 820 918 795 812
Other adjustments 0 0 0 0
Charge-offs (172) (179) (352) (326)
Recoveries 28 32 93 61
Provision for credit losses 323 78 463 302
Allowance for credit losses at period end 999 849 999 849
Individually measured 6 4 6 4
Collectively measured 993 845 993 845
Individually measured 113 41 113 41
Collectively measured 143,898 116,464 143,898 116,464
Loans held at fair value $ 0 $ 0 $ 0 $ 0