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Loans and Leases Held for Investment - Allowance for Loan and Lease Losses and Reserve for Unfunded Loan Commitments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Receivables [Abstract]                
Reserve for Unfunded Loan Commitments, Balance, beginning of period $ 29,221 $ 27,571 $ 29,071 $ 29,571        
Allowance for Credit Losses, Balance, beginning of period 258,565 275,333 268,431 311,258        
Reserve for Unfunded Loan Commitments, Charge-offs 0 0 0 0        
Allowance for Credit Losses, Charge-offs (6,465) (4,163) (69,964) (67,247)        
Reserve for Unfunded Loan Commitments, Recoveries 0 0 0 0        
Allowance for Credit Losses, Recoveries 8,922 1,746 14,125 7,905        
Reserve for Unfunded Loan Commitments, Net charge-offs 0 0 0 0        
Allowance For Credit Losses, Net charge-offs 2,457 (2,417) (55,839) (59,342)        
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) 8,700 9,000 56,980 32,000        
Provision for Loan, Leases and Unfunded Loan Commitments 9,700 9,000 58,130 30,000        
Reserve for Unfunded Commitments, Provision (negative provision) 1,000 0 (1,150) (2,000)        
Reserve for Unfunded Loan Commitments, Balance, end of period 30,221 27,571 30,221 27,571        
Allowance for Credit Losses, Balance, end of period 270,722 281,916 270,722 281,916        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 240,501 254,345 240,501 254,345 $ 229,344 $ 239,360 $ 247,762 $ 281,687
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery 2,457 (2,417) (55,839) (59,342)        
Financing Receivable, Allowance for Receivable Charge-offs and Recoveries [Line Items]                
Allowance for Credit Losses, Recoveries 8,922 1,746 14,125 7,905        
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery (2,457) 2,417 55,839 59,342        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 240,501 254,345 240,501 254,345 229,344 239,360 247,762 281,687
Allowance for Credit Losses, Charge-offs 6,465 4,163 69,964 67,247        
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) 8,700 9,000 56,980 32,000        
Real Estate Mortgage                
Receivables [Abstract]                
Allowance for Credit Losses, Charge-offs (2,455) (640) (24,324) (56,998)        
Allowance for Credit Losses, Recoveries 1,602 216 2,212 2,536        
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) 3,456 9,798 (13,906) 32,269        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 137,548 164,634 137,548 164,634 134,945 145,754 155,260 186,827
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery (853) (424) (22,112) (54,462)        
Financing Receivable, Allowance for Receivable Charge-offs and Recoveries [Line Items]                
Allowance for Credit Losses, Recoveries 1,602 216 2,212 2,536        
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery 853 424 22,112 54,462        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 137,548 164,634 137,548 164,634 134,945 145,754 155,260 186,827
Allowance for Credit Losses, Charge-offs 2,455 640 24,324 56,998        
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) 3,456 9,798 (13,906) 32,269        
Real Estate Construction and Land                
Receivables [Abstract]                
Allowance for Credit Losses, Charge-offs 0 0 (21,536) 0        
Allowance for Credit Losses, Recoveries 1,370 0 1,370 0        
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) 205 (11,943) 17,864 (20,492)        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 8,638 13,338 8,638 13,338 7,063 10,940 25,281 33,830
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery 1,370 0 (20,166) 0        
Financing Receivable, Allowance for Receivable Charge-offs and Recoveries [Line Items]                
Allowance for Credit Losses, Recoveries 1,370 0 1,370 0        
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery (1,370) 0 20,166 0        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 8,638 13,338 8,638 13,338 7,063 10,940 25,281 33,830
Allowance for Credit Losses, Charge-offs 0 0 21,536 0        
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) 205 (11,943) 17,864 (20,492)        
Commercial                
Receivables [Abstract]                
Allowance for Credit Losses, Charge-offs (3,052) (1,963) (21,227) (5,815)        
Allowance for Credit Losses, Recoveries 5,833 1,253 10,224 4,956        
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) 4,746 10,387 24,027 16,574        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 80,857 60,871 80,857 60,871 73,330 67,833 51,194 45,156
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery 2,781 (710) (11,003) (859)        
Financing Receivable, Allowance for Receivable Charge-offs and Recoveries [Line Items]                
Allowance for Credit Losses, Recoveries 5,833 1,253 10,224 4,956        
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery (2,781) 710 11,003 859        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 80,857 60,871 80,857 60,871 73,330 67,833 51,194 45,156
Allowance for Credit Losses, Charge-offs 3,052 1,963 21,227 5,815        
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) 4,746 10,387 24,027 16,574        
Consumer                
Receivables [Abstract]                
Allowance for Credit Losses, Charge-offs (958) (1,560) (2,877) (4,434)        
Allowance for Credit Losses, Recoveries 117 277 319 413        
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) 293 758 1,183 3,649        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 13,458 15,502 13,458 15,502 14,006 14,833 16,027 15,874
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery (841) (1,283) (2,558) (4,021)        
Financing Receivable, Allowance for Receivable Charge-offs and Recoveries [Line Items]                
Allowance for Credit Losses, Recoveries 117 277 319 413        
Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery 841 1,283 2,558 4,021        
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 13,458 15,502 13,458 15,502 $ 14,006 $ 14,833 $ 16,027 $ 15,874
Allowance for Credit Losses, Charge-offs 958 1,560 2,877 4,434        
Financing Receivable, Excluding Accrued Interest, Credit Loss Expense (Reversal) $ 293 $ 758 $ 1,183 $ 3,649