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Loans and Leases - Performance of Loans Modified in Last 12 Months (Details)
$ in Millions
Sep. 30, 2023
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total $ 32
Current Loans  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total 23
Loans 30-89 Days Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total 0
90+ Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total 9
Mortgage Loans: | One-to-four family first mortgage  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total 10
Mortgage Loans: | One-to-four family first mortgage | Current Loans  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total 1
Mortgage Loans: | One-to-four family first mortgage | Loans 30-89 Days Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total 0
Mortgage Loans: | One-to-four family first mortgage | 90+ Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total 9
Other Loans: | Commercial and industrial  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total 21
Other Loans: | Commercial and industrial | Current Loans  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total 21
Other Loans: | Commercial and industrial | Loans 30-89 Days Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total 0
Other Loans: | Commercial and industrial | 90+ Past Due  
Financing Receivable, Troubled Debt Restructuring [Line Items]  
Total 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