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Loans and Leases - Amortized Cost Within Twelve Months (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 7 | $ 4
Principal Forgiveness |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 1 | 0
Combination - Interest Rate Reduction & Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 1 | 4
Loans held for investment | Commercial real estate | Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 4 |
Loans held for investment | Commercial real estate | Principal Forgiveness |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 0 |
Loans held for investment | Commercial real estate | Combination - Interest Rate Reduction & Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 0 |
Loans held for investment | One-to-four family first mortgage | Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 2 | 4
Loans held for investment | One-to-four family first mortgage | Principal Forgiveness |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 1 | 0
Loans held for investment | One-to-four family first mortgage | Combination - Interest Rate Reduction & Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 1 | $ 4
Other loans held for investment | Commercial and industrial | Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 1 |
Other loans held for investment | Commercial and industrial | Principal Forgiveness |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 0 |
Other loans held for investment | Commercial and industrial | Combination - Interest Rate Reduction & Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 0 |

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