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Loans and Leases Held for Investment - Allowance for Loan and Lease Losses (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
Allowance for Loan and Lease Losses [Roll Forward]                
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        
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, Excluding Accrued Interest, Credit Loss Expense (Reversal) 8,700 9,000 56,980 32,000        
Amount of the allowance applicable to loans and leases:                
Individually evaluated 0 8,196 0 8,196        
Collectively evaluated 240,501 246,149 240,501 246,149        
The ending balance of the loan and lease portfolio is composed of loans and leases:                
Individually evaluated 171,990 166,356 171,990 166,356        
Collectively evaluated 23,938,652 23,361,421 23,938,652 23,361,421        
Loans held for investment, net 24,110,642 23,527,777 24,110,642 23,527,777   23,781,663    
Real Estate Mortgage                
Allowance for Loan and Lease Losses [Roll Forward]                
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        
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, Excluding Accrued Interest, Credit Loss Expense (Reversal) 3,456 9,798 (13,906) 32,269        
Amount of the allowance applicable to loans and leases:                
Individually evaluated 0 0 0 0        
Collectively evaluated 137,548 164,634 137,548 164,634        
The ending balance of the loan and lease portfolio is composed of loans and leases:                
Individually evaluated 166,678 129,829 166,678 129,829        
Collectively evaluated 13,413,184 13,204,577 13,413,184 13,204,577        
Loans held for investment, net 13,579,862 13,334,406 13,579,862 13,334,406   13,427,659    
Real Estate Construction and Land                
Allowance for Loan and Lease Losses [Roll Forward]                
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        
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, Excluding Accrued Interest, Credit Loss Expense (Reversal) 205 (11,943) 17,864 (20,492)        
Amount of the allowance applicable to loans and leases:                
Individually evaluated 0 0 0 0        
Collectively evaluated 8,638 13,338 8,638 13,338        
The ending balance of the loan and lease portfolio is composed of loans and leases:                
Individually evaluated 0 0 0 0        
Collectively evaluated 2,154,826 3,459,409 2,154,826 3,459,409        
Loans held for investment, net 2,154,826 3,459,409 2,154,826 3,459,409   3,172,293    
Commercial                
Allowance for Loan and Lease Losses [Roll Forward]                
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        
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, Excluding Accrued Interest, Credit Loss Expense (Reversal) 4,746 10,387 24,027 16,574        
Amount of the allowance applicable to loans and leases:                
Individually evaluated 0 8,196 0 8,196        
Collectively evaluated 80,857 52,675 80,857 52,675        
The ending balance of the loan and lease portfolio is composed of loans and leases:                
Individually evaluated 4,981 36,527 4,981 36,527        
Collectively evaluated 8,001,676 6,282,945 8,001,676 6,282,945        
Loans held for investment, net 8,006,657 6,319,472 8,006,657 6,319,472   6,778,829    
Consumer                
Allowance for Loan and Lease Losses [Roll Forward]                
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        
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, Excluding Accrued Interest, Credit Loss Expense (Reversal) 293 758 1,183 3,649        
Amount of the allowance applicable to loans and leases:                
Individually evaluated 0 0 0 0        
Collectively evaluated 13,458 15,502 13,458 15,502        
The ending balance of the loan and lease portfolio is composed of loans and leases:                
Individually evaluated 331 0 331 0        
Collectively evaluated 368,966 414,490 368,966 414,490        
Loans held for investment, net $ 369,297 $ 414,490 $ 369,297 $ 414,490   $ 402,882