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Loans and Allowance for Credit Losses - Nonperforming Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Accounts Notes And Loans Receivable [Line Items] |  |  |
Loans held for investment |  | $ 20,738,294 | $ 21,057,616
Other real estate owned |  | $ 13,750 | $ 5,701
Nonperforming assets to total loans and other real estate |  | 0.54% | 0.37%
Nonperforming assets to total loans, excluding Warehouse Purchase Program loans, and other real estate |  | 0.58% | 0.39%
Nonaccrual loans to total loans |  | 0.48% | 0.33%
Nonaccrual loans to total loans, excluding Warehouse Purchase Program loans |  | 0.51% | 0.35%
Nonperforming Financial Loans [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Loans held for investment |  | $ 105,797 | $ 75,836
Repossessed assets |  | 16 | 4
Other real estate owned |  | 13,750 | 5,701
Total nonperforming assets |  | 119,563 | 81,541
Nonperforming Financial Loans [Member] | Finance Receivable Nonaccrual Status [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Loans held for investment | [1] | 105,529 | 73,647
Nonperforming Financial Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Loans held for investment |  | $ 268 | $ 2,189
[1] | There were no nonperforming Warehouse Purchase Program loans or Warehouse Purchase Program lines of credit for the periods presented.

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