Loans and Leases - Loan Modification Subsequently Defaulted (Details) - Loans and leases held for investment: - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total				$ 7
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total				5
Principal Forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total				0
Combination - Interest Rate Reduction and Term/Payment Extension/Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total				2
Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total				4
Commercial real estate | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total				4
Commercial real estate | Principal Forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total				0
Commercial real estate | Combination - Interest Rate Reduction and Term/Payment Extension/Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total				0
One-to-four family first mortgage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 11	$ 3	$ 11	3
One-to-four family first mortgage | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	6	1	6	1
One-to-four family first mortgage | Principal Forgiveness
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	1	0	1	0
One-to-four family first mortgage | Combination - Interest Rate Reduction and Term/Payment Extension/Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 4	$ 2	$ 4	$ 2