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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 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance for credit losses at beginning of period $ 427,175 $ 375,798 $ 427,265 $ 357,448  
Other adjustments (19) 41 (50) 45  
Charge-offs (34,756) (18,516) (58,597) (25,867)  
Recoveries 4,770 1,486 6,861 3,372  
Provision for credit losses 39,899 28,571 61,590 51,641  
Allowance for credit losses at period end 437,069 387,380 437,069 387,380 $ 357,448
Accounting Standards Update [Extensible Enumeration]         Accounting Standards Update 2022-02 [Member]
Individually measured 37,290 13,130 37,290 13,130  
Collectively measured 399,779 374,250 399,779 374,250  
Loans at period end, individually evaluated for impairment 118,286 73,804 118,286 73,804  
Loans at period end, collectively evaluated for impairment 44,421,411 40,749,157 44,421,411 40,749,157  
Loans held-for-investment 135,834 200,447 135,834 $ 200,447  
Accounting Standards Update 2016-13          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Accounting Standards Update [Extensible Enumeration]       Accounting Standards Update 2016-13  
Cumulative Effect, Period of Adoption, Adjustment          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance for credit losses at beginning of period       $ 741  
Allowance for credit losses at period end         $ 741
Commercial          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance for credit losses at beginning of period 166,518 149,501 169,604 142,769  
Other adjustments 0 0 0 0  
Charge-offs (9,584) (5,629) (20,799) (8,172)  
Recoveries 950 505 1,429 897  
Provision for credit losses 24,107 (1,235) 31,757 7,537  
Allowance for credit losses at period end 181,991 143,142 181,991 143,142 142,769
Individually measured 30,927 7,205 30,927 7,205  
Collectively measured 151,064 135,937 151,064 135,937  
Loans at period end, individually evaluated for impairment 51,087 40,460 51,087 40,460  
Loans at period end, collectively evaluated for impairment 14,103,375 12,560,011 14,103,375 12,560,011  
Loans held-for-investment 0 0 0 0  
Commercial | Cumulative Effect, Period of Adoption, Adjustment          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance for credit losses at beginning of period       111  
Allowance for credit losses at period end         111
Commercial Real Estate          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance for credit losses at beginning of period 226,052 194,780 223,853 184,352  
Other adjustments 0 0 0 0  
Charge-offs (15,526) (8,124) (20,995) (8,129)  
Recoveries 90 25 121 125  
Provision for credit losses 13,112 29,015 20,749 37,992  
Allowance for credit losses at period end 223,728 215,696 223,728 215,696 184,352
Individually measured 6,330 5,819 6,330 5,819  
Collectively measured 217,398 209,877 217,398 209,877  
Loans at period end, individually evaluated for impairment 48,289 18,483 48,289 18,483  
Loans at period end, collectively evaluated for impairment 11,898,908 10,590,328 11,898,908 10,590,328  
Loans held-for-investment 0 0 0 0  
Commercial Real Estate | Cumulative Effect, Period of Adoption, Adjustment          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance for credit losses at beginning of period       1,356  
Allowance for credit losses at period end         1,356
Home  Equity          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance for credit losses at beginning of period 7,191 7,728 7,116 7,573  
Other adjustments 0 0 0 0  
Charge-offs 0 0 (74) 0  
Recoveries 35 37 64 72  
Provision for credit losses 16 (798) 136 (645)  
Allowance for credit losses at period end 7,242 6,967 7,242 6,967 7,573
Individually measured 0 0 0 0  
Collectively measured 7,242 6,967 7,242 6,967  
Loans at period end, individually evaluated for impairment 1,100 1,361 1,100 1,361  
Loans at period end, collectively evaluated for impairment 355,213 335,613 355,213 335,613  
Loans held-for-investment 0 0 0 0  
Home  Equity | Cumulative Effect, Period of Adoption, Adjustment          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance for credit losses at beginning of period       (33)  
Allowance for credit losses at period end         (33)
Residential real estate          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance for credit losses at beginning of period 13,701 11,434 13,133 11,585  
Other adjustments 0 0 0 0  
Charge-offs (23) 0 (61) 0  
Recoveries 8 6 10 10  
Provision for credit losses (4,913) 812 (4,309) 1,349  
Allowance for credit losses at period end 8,773 12,252 8,773 12,252 11,585
Individually measured 32 106 32 106  
Collectively measured 8,741 12,146 8,741 12,146  
Loans at period end, individually evaluated for impairment 17,807 13,496 17,807 13,496  
Loans at period end, collectively evaluated for impairment 2,913,694 2,429,297 2,913,694 2,429,297  
Loans held-for-investment 135,834 200,447 135,834 200,447  
Residential real estate | Cumulative Effect, Period of Adoption, Adjustment          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance for credit losses at beginning of period       (692)  
Allowance for credit losses at period end         (692)
Premium Finance Receivables          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance for credit losses at beginning of period 13,330 11,955 13,069 10,671  
Other adjustments (19) 41 (50) 45  
Charge-offs (9,486) (4,653) (16,424) (9,303)  
Recoveries 3,663 890 5,190 2,213  
Provision for credit losses 7,258 813 12,961 5,420  
Allowance for credit losses at period end 14,746 9,046 14,746 9,046 10,671
Individually measured 0 0 0 0  
Collectively measured 14,746 9,046 14,746 9,046  
Loans at period end, individually evaluated for impairment 0 0 0 0  
Loans at period end, collectively evaluated for impairment 15,062,868 14,801,971 15,062,868 14,801,971  
Loans held-for-investment 0 0 0 0  
Premium Finance Receivables | Cumulative Effect, Period of Adoption, Adjustment          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance for credit losses at beginning of period       0  
Allowance for credit losses at period end         0
Consumer and Other          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance for credit losses at beginning of period 383 400 490 498  
Other adjustments 0 0 0 0  
Charge-offs (137) (110) (244) (263)  
Recoveries 24 23 47 55  
Provision for credit losses 319 (36) 296 (12)  
Allowance for credit losses at period end 589 277 589 277 498
Individually measured 1 0 1 0  
Collectively measured 588 277 588 277  
Loans at period end, individually evaluated for impairment 3 4 3 4  
Loans at period end, collectively evaluated for impairment 87,353 31,937 87,353 31,937  
Loans held-for-investment $ 0 $ 0 $ 0 0  
Consumer and Other | Cumulative Effect, Period of Adoption, Adjustment          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance for credit losses at beginning of period       $ (1)  
Allowance for credit losses at period end         $ (1)