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Loans and Leases - Performance of Loans Modified in Last 12 Months (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Jun. 30, 2024
--- | --- | ---
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | $ 28 | $ 256
Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 11 | 58
30 - 89 Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 0 | 102
90+ Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 17 | 96
Loans and leases held for investment: | Multi-family |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total |  | 123
Loans and leases held for investment: | Multi-family | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total |  | 26
Loans and leases held for investment: | Multi-family | 30 - 89 Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total |  | 97
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 | 6 | 102
Loans and leases held for investment: | Commercial real estate | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 6 | 21
Loans and leases held for investment: | Commercial real estate | 30 - 89 Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 0 | 3
Loans and leases held for investment: | Commercial real estate | 90+ Past Due |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 0 | 78
Loans and leases held for investment: | One-to-four family first mortgage |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 21 | 17
Loans and leases held for investment: | One-to-four family first mortgage | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 5 | 8
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 | 16 | 9
Other loans held for investment | Commercial and Industrial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 1 | 13
Other loans held for investment | Commercial and Industrial | Current |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total | 0 | 3
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 | 8
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 |  | 0
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 |  | $ 1

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