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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, 2025
Mar. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Allowance for credit losses at beginning of period $ 436,603 $ 427,265
Other adjustments 4 (31)
Charge-offs (17,449) (23,841)
Recoveries 4,809 2,091
Provision for credit losses - Other 23,974  
Provision for credit losses 24,000 21,691
Allowance for credit losses at period end 447,941 427,175
Individually measured 32,192 15,841
Collectively measured 415,749 411,334
Individually measured 121,269 89,368
Collectively measured 48,460,600 42,996,973
Loans held at fair value 126,521 144,365
Commercial    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Allowance for credit losses at beginning of period 175,837 169,604
Other adjustments 0 0
Charge-offs (9,722) (11,215)
Recoveries 929 479
Provision for credit losses - Other 34,139  
Provision for credit losses   7,650
Allowance for credit losses at period end 201,183 166,518
Individually measured 25,278 13,989
Collectively measured 175,905 152,529
Individually measured 70,560 31,740
Collectively measured 15,860,766 13,471,741
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 222,856 223,853
Other adjustments 0 0
Charge-offs (454) (5,469)
Recoveries 12 31
Provision for credit losses - Other (12,404)  
Provision for credit losses   7,637
Allowance for credit losses at period end 210,010 226,052
Individually measured 6,772 1,784
Collectively measured 203,238 224,268
Individually measured 26,187 39,262
Collectively measured 12,888,714 11,594,175
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 8,943 7,116
Other adjustments 0 0
Charge-offs 0 (74)
Recoveries 216 29
Provision for credit losses - Other (20)  
Provision for credit losses   120
Allowance for credit losses at period end 9,139 7,191
Individually measured 85 0
Collectively measured 9,054 7,191
Individually measured 2,070 838
Collectively measured 453,613 339,511
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 10,335 13,133
Other adjustments 0 0
Charge-offs 0 (38)
Recoveries 136 2
Provision for credit losses - Other 181  
Provision for credit losses   604
Allowance for credit losses at period end 10,652 13,701
Individually measured 43 59
Collectively measured 10,609 13,642
Individually measured 22,434 17,509
Collectively measured 3,536,204 2,728,392
Loans held at fair value 126,521 144,365
Premium Finance Receivables    
Financing Receivable, Allowance for Credit Loss [Roll Forward]    
Allowance for credit losses at beginning of period 17,820 13,069
Other adjustments 4 (31)
Charge-offs (7,126) (6,938)
Recoveries 3,487 1,527
Provision for credit losses - Other 1,854  
Provision for credit losses   5,703
Allowance for credit losses at period end 16,039 13,330
Individually measured 0 0
Collectively measured 16,039 13,330
Individually measured 0 0
Collectively measured 15,605,002 14,812,052
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 812 490
Other adjustments 0 0
Charge-offs (147) (107)
Recoveries 29 23
Provision for credit losses - Other 224  
Provision for credit losses   (23)
Allowance for credit losses at period end 918 383
Individually measured 14 9
Collectively measured 904 374
Individually measured 18 19
Collectively measured 116,301 51,102
Loans held at fair value $ 0 $ 0