Loans and Leases - Performance of Loans Modified in Last 12 Months (Details) $ in Millions	Jun. 30, 2023 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 6
Current Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0
Loans 30-89 Days Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0
90 Days or Greater Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	6
Mortgage Loans: | One-to-four family first mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	6
Mortgage Loans: | One-to-four family first mortgage | Current Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0
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 Days or Greater Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 6