Loans and Allowance for Credit Losses - Nonperforming Assets (Parenthetical) (Details) - USD ($) |
Mar. 31, 2026 |
Dec. 31, 2025 |
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|---|---|---|---|---|
| Accounts Notes And Loans Receivable [Line Items] | ||||
| Loans held for investment | $ 23,832,909,000 | $ 20,486,415,000 | ||
| Nonperforming Financial Loans [Member] | ||||
| Accounts Notes And Loans Receivable [Line Items] | ||||
| Loans held for investment | 108,714,000 | 137,534,000 | ||
| Nonperforming Financial Loans [Member] | Finance Receivable Nonaccrual Status [Member] | ||||
| Accounts Notes And Loans Receivable [Line Items] | ||||
| Loans held for investment | [1] | 106,473,000 | 137,217,000 | |
| Troubled Debt Restructuring [Member] | Nonperforming Financial Loans [Member] | Finance Receivable Nonaccrual Status [Member] | Warehouse Purchase Program [Member] | ||||
| Accounts Notes And Loans Receivable [Line Items] | ||||
| Loans held for investment | $ 0 | $ 0 | ||
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