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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