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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 12 Months Ended
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Allowance for credit losses at beginning of period   $ 436,603 $ 427,265
Other adjustments   167 (207)
Charge-offs $ (27,076) (91,866) (109,346)
Recoveries   19,551 14,950
Provision for credit losses - other   95,750  
Provision for credit losses   95,800 85,390
Provision for credit losses - Day 1 on non-PCD assets acquired during the period     15,547
Initial allowance for credit losses recognized on PCD assets acquired during the period     3,004
Allowance for credit losses at period end 460,205 460,205 436,603
Individually evaluated for impairment 24,072 24,072 34,757
Collectively evaluated for impairment 436,133 436,133 401,846
Individually evaluated for impairment 137,209 137,209 119,325
Collectively evaluated for impairment 52,816,302 52,816,302 47,776,917
Loans held-for-investment 151,590 151,590 158,795
Commercial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Allowance for credit losses at beginning of period   175,837 169,604
Other adjustments   0
Charge-offs   (50,361) (48,864)
Recoveries   5,080 2,853
Provision for credit losses - other   47,989  
Provision for credit losses     47,439
Provision for credit losses - Day 1 on non-PCD assets acquired during the period     2,967
Initial allowance for credit losses recognized on PCD assets acquired during the period     1,838
Allowance for credit losses at period end 178,545 178,545 175,837
Individually evaluated for impairment 19,054 19,054 27,894
Collectively evaluated for impairment 159,491 159,491 147,943
Individually evaluated for impairment 78,059 78,059 73,490
Collectively evaluated for impairment 16,966,627 16,966,627 15,501,061
Loans held-for-investment 0 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   (11,934) (22,127)
Recoveries   267 323
Provision for credit losses - other   35,744  
Provision for credit losses     9,164
Provision for credit losses - Day 1 on non-PCD assets acquired during the period     10,540
Initial allowance for credit losses recognized on PCD assets acquired during the period     1,103
Allowance for credit losses at period end 246,933 246,933 222,856
Individually evaluated for impairment 4,890 4,890 6,768
Collectively evaluated for impairment 242,043 242,043 216,088
Individually evaluated for impairment 25,147 25,147 21,042
Collectively evaluated for impairment 13,915,589 13,915,589 12,882,902
Loans held-for-investment 0 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   (138) (74)
Recoveries   378 359
Provision for credit losses - other   1,219  
Provision for credit losses     196
Provision for credit losses - Day 1 on non-PCD assets acquired during the period     1,344
Initial allowance for credit losses recognized on PCD assets acquired during the period     2
Allowance for credit losses at period end 10,402 10,402 8,943
Individually evaluated for impairment 0 0 50
Collectively evaluated for impairment 10,402 10,402 8,893
Individually evaluated for impairment 1,221 1,221 1,117
Collectively evaluated for impairment 479,304 479,304 443,911
Loans held-for-investment 0 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   (26) (175)
Recoveries   140 15
Provision for credit losses - other   2,070  
Provision for credit losses     (3,337)
Provision for credit losses - Day 1 on non-PCD assets acquired during the period     638
Initial allowance for credit losses recognized on PCD assets acquired during the period     61
Allowance for credit losses at period end 12,519 12,519 10,335
Individually evaluated for impairment 120 120 44
Collectively evaluated for impairment 12,399 12,399 10,291
Individually evaluated for impairment 32,774 32,774 23,674
Collectively evaluated for impairment 4,132,868 4,132,868 3,430,296
Loans held-for-investment 151,590 151,590 158,795
Premium Finance Receivable      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Allowance for credit losses at beginning of period   17,820 13,069
Other adjustments   167 (207)
Charge-offs   (28,704) (37,519)
Recoveries   13,556 11,313
Provision for credit losses - other   8,172  
Provision for credit losses     31,164
Provision for credit losses - Day 1 on non-PCD assets acquired during the period     0
Initial allowance for credit losses recognized on PCD assets acquired during the period     0
Allowance for credit losses at period end 11,011 11,011 17,820
Individually evaluated for impairment 0
Collectively evaluated for impairment 11,011 11,011 17,820
Individually evaluated for impairment 0 0 0
Collectively evaluated for impairment 17,207,058 17,207,058 15,419,187
Loans held-for-investment 0 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   (703) (587)
Recoveries   130 87
Provision for credit losses - other   556  
Provision for credit losses     764
Provision for credit losses - Day 1 on non-PCD assets acquired during the period     58
Initial allowance for credit losses recognized on PCD assets acquired during the period     0
Allowance for credit losses at period end 795 795 812
Individually evaluated for impairment 8 8 1
Collectively evaluated for impairment 787 787 811
Individually evaluated for impairment 8 8 2
Collectively evaluated for impairment 114,856 114,856 99,560
Loans held-for-investment $ 0 $ 0 $ 0