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Loans and Leases - Loan Modification Subsequently Defaulted (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 8
Combination - Interest Rate Reduction & Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	1
One-to-four family first mortgage | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		$ 3
One-to-four family first mortgage | Combination - Interest Rate Reduction & Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		$ 5
Loans and Leases Held for Investment: | Commercial real estate | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	4
Loans and Leases Held for Investment: | Commercial real estate | Combination - Interest Rate Reduction & Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0
Loans and Leases Held for Investment: | One-to-four family first mortgage | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0
Loans and Leases Held for Investment: | One-to-four family first mortgage | Combination - Interest Rate Reduction & Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	1
Other loans held for investment | Commercial and industrial | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	4
Other loans held for investment | Commercial and industrial | Combination - Interest Rate Reduction & Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 0

X

- Definition

Amortized cost excluding accrued interest, of financing receivable with payment default in current period and modified within previous 12 months preceding payment default for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 44
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-44

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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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