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Loans and Leases - Quality of Loans Held for Sale (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Recorded Investment, Past Due
Total non-accrual loans held for sale	$ 189	$ 164
Loans and Leases Held for Investment: | Commercial real estate
Financing Receivable, Recorded Investment, Past Due
Total non-accrual loans held for sale	112	163
Loans and Leases Held for Investment: | One-to-four family first mortgage
Financing Receivable, Recorded Investment, Past Due
Total non-accrual loans held for sale	64	0
Loans and Leases Held for Investment: | Acquisition, development, and construction
Financing Receivable, Recorded Investment, Past Due
Total non-accrual loans held for sale	$ 13	$ 1

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