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Loans and Leases - Amortized Cost Within Twelve Months (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified that subsequently defaulted | $ 8 |
Combination - Interest Rate Reduction & Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified that subsequently defaulted | 1 |
One-to-four family first mortgage | Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified that subsequently defaulted |  | $ 3
One-to-four family first mortgage | Combination - Interest Rate Reduction & Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified that subsequently defaulted |  | $ 5
Loans and Leases Held for Investment: | Commercial real estate | Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified that subsequently defaulted | 4 |
Loans and Leases Held for Investment: | Commercial real estate | Combination - Interest Rate Reduction & Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified that subsequently defaulted | 0 |
Loans and Leases Held for Investment: | One-to-four family first mortgage | Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified that subsequently defaulted | 0 |
Loans and Leases Held for Investment: | One-to-four family first mortgage | Combination - Interest Rate Reduction & Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified that subsequently defaulted | 1 |
Other loans held for investment | Commercial and industrial | Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified that subsequently defaulted | 4 |
Other loans held for investment | Commercial and industrial | Combination - Interest Rate Reduction & Term Extension |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans modified that subsequently defaulted | $ 0 |

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