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Loans and Leases - Performance of Loans Modified in Last 12 Months (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Mar. 31, 2023
--- | --- | ---
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | $ 35 | $ 47
Current Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 25 | 44
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 | 8 | 3
Mortgage Loans: | Multi-family |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 8 |
Mortgage Loans: | Multi-family | Current Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 8 |
Mortgage Loans: | Multi-family | Loans 30-89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 0 |
Mortgage Loans: | Multi-family | 90+ Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 0 |
Mortgage Loans: | Commercial real estate |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 2 |
Mortgage Loans: | Commercial real estate | Current Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 2 |
Mortgage Loans: | Commercial real estate | Loans 30-89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 0 |
Mortgage Loans: | Commercial real estate | 90+ Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 0 |
Mortgage Loans: | One-to-four family first mortgage |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 10 | 3
Mortgage Loans: | One-to-four family first mortgage | Current Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 2 | 0
Mortgage Loans: | One-to-four family first mortgage | Loans 30-89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 0 | 0
Mortgage Loans: | One-to-four family first mortgage | 90+ Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 8 | 3
Other Loans: | Commercial and industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 14 | 44
Other Loans: | Commercial and industrial | Current Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 12 | 44
Other Loans: | Commercial and industrial | Loans 30-89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 2 | 0
Other Loans: | Commercial and industrial | 90+ Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 0 | $ 0
Other Loans: | Other |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 1 |
Other Loans: | Other | Current Loans |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 1 |
Other Loans: | Other | Loans 30-89 Days Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 0 |
Other Loans: | Other | 90+ Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | $ 0 |

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