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Loans and Leases - Performance of Loans Modified in Last 12 Months (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Mar. 31, 2024
--- | --- | ---
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | $ 17 | $ 35
Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 6 | 25
30 - 89 Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 0 | 2
90+ Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 11 | 8
Loans and Leases Held for Investment: | Multi-family |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total |  | 8
Loans and Leases Held for Investment: | Multi-family | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total |  | 8
Loans and Leases Held for Investment: | Multi-family | 30 - 89 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 | 4 | 2
Loans and Leases Held for Investment: | Commercial real estate | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 0 | 2
Loans and Leases Held for Investment: | Commercial real estate | 30 - 89 Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 0 | 0
Loans and Leases Held for Investment: | Commercial real estate | 90+ Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 4 | 0
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 | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 6 | 2
Loans and Leases Held for Investment: | One-to-four family first mortgage | 30 - 89 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 | 6 | 8
Other loans held for investment | Commercial and industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 1 | 14
Other loans held for investment | Commercial and industrial | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 0 | 12
Other loans held for investment | Commercial and industrial | 30 - 89 Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 0 | 2
Other loans held for investment | Commercial and industrial | 90+ Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | $ 1 | 0
Other loans held for investment | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total |  | 1
Other loans held for investment | Other | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total |  | 1
Other loans held for investment | Other | 30 - 89 Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total |  | 0
Other loans held for investment | Other | 90+ Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total |  | $ 0

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