Loans and Leases - Schedule of Experiencing Financial Difficulty that Subsequently Defaulted (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 18	$ 7	$ 4
Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	1	0
Combination - Interest Rate Reduction and Term/Payment Extension/Delay
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	9	1	4
Loans held for investment \| Commercial real estate \| Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total		4
Loans held for investment \| Commercial real estate \| Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total		0
Loans held for investment \| Commercial real estate \| Combination - Interest Rate Reduction and Term/Payment Extension/Delay
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total		0
Loans held for investment \| One-to-four family first mortgage \| Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	13	2	4
Loans held for investment \| One-to-four family first mortgage \| Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	1	0
Loans held for investment \| One-to-four family first mortgage \| Combination - Interest Rate Reduction and Term/Payment Extension/Delay
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	7	1	$ 4
Loans held for investment \| Commercial and industrial \| Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	5	1
Loans held for investment \| Commercial and industrial \| Principal Forgiveness
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	0	0
Loans held for investment \| Commercial and industrial \| Combination - Interest Rate Reduction and Term/Payment Extension/Delay
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 2	$ 0