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Loans and Leases - Collateral (Details) - Asset pledged as collateral $ in Millions	Sep. 30, 2023 USD ($)
Real Property
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total collateral-dependent loans held for investment	$ 372
Real Property | Mortgage Loans: | Multi-family
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total collateral-dependent loans held for investment	102
Real Property | Mortgage Loans: | Commercial real estate
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total collateral-dependent loans held for investment	170
Real Property | Mortgage Loans: | One-to-four family first mortgage
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total collateral-dependent loans held for investment	100
Real Property | Other Loans: | Commercial and industrial
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total collateral-dependent loans held for investment	0
Real Property | Other Loans: | Other
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total collateral-dependent loans held for investment	0
Other
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total collateral-dependent loans held for investment	33
Other | Mortgage Loans: | Multi-family
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total collateral-dependent loans held for investment	0
Other | Mortgage Loans: | Commercial real estate
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total collateral-dependent loans held for investment	0
Other | Mortgage Loans: | One-to-four family first mortgage
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total collateral-dependent loans held for investment	0
Other | Other Loans: | Commercial and industrial
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total collateral-dependent loans held for investment	33
Other | Other Loans: | Other
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total collateral-dependent loans held for investment	$ 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/2003/role/disclosureRef
-Topic 860
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481444/860-30-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(11))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479617/946-210-S99-1

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- Definition

The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 940
-SubTopic 320
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481961/940-320-45-2

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