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Loans and Allowance for Credit Losses - Nonperforming Assets (Parenthetical) (Details) - USD ($) | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Accounts Notes And Loans Receivable [Line Items] |  |  |
Loans held for investment |  | $ 21,146,033,000 | $ 20,352,559,000
Nonperforming Financial Loans [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Loans held for investment |  | 83,989,000 | 70,883,000
Nonperforming Financial Loans [Member] | Finance Receivable Nonaccrual Status [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Loans held for investment | [1],[2] | 83,969,000 | 68,688,000
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
[1] | ASU 2022-02 became effective for the Company on January 1, 2023.
[2] | There were no nonperforming Warehouse Purchase Program loans or Warehouse Purchase Program lines of credit for the periods presented.

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