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Loans and Leases - Performance of Loans Modified in Last 12 Months (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | $ 58 | $ 32
Remaining |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 42 | 23
Loans 30-89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 2 | 0
90+ Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 14 | 9
Loans and Leases Held for Investment: | Multi-family |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 24 |
Loans and Leases Held for Investment: | Multi-family | Remaining |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 24 |
Loans and Leases Held for Investment: | Multi-family | Loans 30-89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 0 |
Loans and Leases Held for Investment: | Multi-family | 90+ Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 0 |
Loans and Leases Held for Investment: | Commercial real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 12 |
Loans and Leases Held for Investment: | Commercial real estate | Remaining |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 8 |
Loans and Leases Held for Investment: | Commercial real estate | Loans 30-89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 0 |
Loans and Leases Held for Investment: | Commercial real estate | 90+ Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 4 |
Loans and Leases Held for Investment: | One-to-four family first mortgage |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 12 | 10
Loans and Leases Held for Investment: | One-to-four family first mortgage | Remaining |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 7 | 1
Loans and Leases Held for Investment: | One-to-four family first mortgage | Loans 30-89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 0 | 0
Loans and Leases Held for Investment: | One-to-four family first mortgage | 90+ Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 5 | 9
Other loans held for investment | Commercial and industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 9 | 21
Other loans held for investment | Commercial and industrial | Remaining |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 2 | 21
Other loans held for investment | Commercial and industrial | Loans 30-89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 2 | 0
Other loans held for investment | Commercial and industrial | 90+ Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 5 | 0
Other loans held for investment | Other Consumer |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 1 | 1
Other loans held for investment | Other Consumer | Remaining |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 1 | 1
Other loans held for investment | Other Consumer | Loans 30-89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 0 | 0
Other loans held for investment | Other Consumer | 90+ Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | $ 0 | $ 0

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