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
Mar. 31, 2026
Mar. 31, 2025
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Allowance for credit losses at beginning of period $ 460,205 $ 436,603
Other adjustments (50) 4
Charge-offs (23,649) (17,449)
Recoveries 5,231 4,809
Provision for credit losses 29,597 23,974
Allowance for credit losses at period end 471,334 447,941
Individually measured 31,585 32,192
Collectively measured 439,749 415,749
Individually measured 132,937 121,269
Collectively measured 53,787,885 48,460,600
Loans held at fair value 150,470 126,521
Commercial    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Allowance for credit losses at beginning of period 178,545 175,837
Other adjustments 0 0
Charge-offs (8,428) (9,722)
Recoveries 1,419 929
Provision for credit losses 39,423 34,139
Allowance for credit losses at period end 210,959 201,183
Individually measured 29,193 25,278
Collectively measured 181,766 175,905
Individually measured 87,750 70,560
Collectively measured 17,675,471 15,860,766
Loans held at fair value 0 0
Commercial real estate    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Allowance for credit losses at beginning of period 246,933 222,856
Other adjustments 0 0
Charge-offs (7,260) (454)
Recoveries 6 12
Provision for credit losses (14,809) (12,404)
Allowance for credit losses at period end 224,870 210,010
Individually measured 2,165 6,772
Collectively measured 222,705 203,238
Individually measured 16,757 26,187
Collectively measured 14,145,529 12,888,714
Loans held at fair value 0 0
Home  Equity    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Allowance for credit losses at beginning of period 10,402 8,943
Other adjustments 0 0
Charge-offs 0 0
Recoveries 303 216
Provision for credit losses (492) (20)
Allowance for credit losses at period end 10,213 9,139
Individually measured 0 85
Collectively measured 10,213 9,054
Individually measured 1,142 2,070
Collectively measured 470,122 453,613
Loans held at fair value 0 0
Residential Real Estate    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Allowance for credit losses at beginning of period 12,519 10,335
Other adjustments 0 0
Charge-offs (350) 0
Recoveries 1 136
Provision for credit losses 911 181
Allowance for credit losses at period end 13,081 10,652
Individually measured 211 43
Collectively measured 12,870 10,609
Individually measured 27,272 22,434
Collectively measured 4,287,424 3,536,204
Loans held at fair value 150,470 126,521
Premium Finance Receivables    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Allowance for credit losses at beginning of period 11,011 17,820
Other adjustments (50) 4
Charge-offs (7,431) (7,126)
Recoveries 3,437 3,487
Provision for credit losses 4,424 1,854
Allowance for credit losses at period end 11,391 16,039
Individually measured 0 0
Collectively measured 11,391 16,039
Individually measured 0 0
Collectively measured 17,086,713 15,605,002
Loans held at fair value 0 0
Consumer and Other    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Allowance for credit losses at beginning of period 795 812
Other adjustments 0 0
Charge-offs (180) (147)
Recoveries 65 29
Provision for credit losses 140 224
Allowance for credit losses at period end 820 918
Individually measured 16 14
Collectively measured 804 904
Individually measured 16 18
Collectively measured 122,626 116,301
Loans held at fair value $ 0 $ 0