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Loans and Leases - Amortized Cost Within Twelve Months (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified that subsequently defaulted	$ 8
Combination - Interest Rate Reduction & Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified that subsequently defaulted	1
One-to-four family first mortgage | Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified that subsequently defaulted		$ 3
One-to-four family first mortgage | Combination - Interest Rate Reduction & Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified that subsequently defaulted		$ 5
Loans and Leases Held for Investment: | Commercial real estate | Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified that subsequently defaulted	4
Loans and Leases Held for Investment: | Commercial real estate | Combination - Interest Rate Reduction & Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified that subsequently defaulted	0
Loans and Leases Held for Investment: | One-to-four family first mortgage | Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified that subsequently defaulted	0
Loans and Leases Held for Investment: | One-to-four family first mortgage | Combination - Interest Rate Reduction & Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified that subsequently defaulted	1
Other loans held for investment | Commercial and industrial | Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified that subsequently defaulted	4
Other loans held for investment | Commercial and industrial | Combination - Interest Rate Reduction & Term Extension
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified that subsequently defaulted	$ 0

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

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- 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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