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Loans and Leases - Collateral (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans and leases held for investment, net of deferred loan fees and costs	$ 84,619	$ 69,001
Other
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans and leases held for investment, net of deferred loan fees and costs	27,911	14,528
Mortgage Loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans and leases held for investment, net of deferred loan fees and costs	56,708	54,473
Mortgage Loans | Multi-family
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans and leases held for investment, net of deferred loan fees and costs	37,265	38,130
Mortgage Loans | Commercial real estate
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans and leases held for investment, net of deferred loan fees and costs	10,470	8,526
Mortgage Loans | One-to-four family first mortgage
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans and leases held for investment, net of deferred loan fees and costs	6,061	5,821
Other Loans:
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans and leases held for investment, net of deferred loan fees and costs	27,911	14,528
Other Loans: | Commercial and industrial
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans and leases held for investment, net of deferred loan fees and costs	22,065	10,597
Other Loans: | Other
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans and leases held for investment, net of deferred loan fees and costs	2,657	$ 2,252
Real Property | Asset pledged as collateral
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans and leases held for investment, net of deferred loan fees and costs	614
Real Property | Mortgage Loans | Multi-family | Asset pledged as collateral
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans and leases held for investment, net of deferred loan fees and costs	253
Real Property | Mortgage Loans | Commercial real estate | Asset pledged as collateral
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans and leases held for investment, net of deferred loan fees and costs	256
Real Property | Mortgage Loans | One-to-four family first mortgage | Asset pledged as collateral
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans and leases held for investment, net of deferred loan fees and costs	105
Real Property | Other Loans: | Commercial and industrial | Asset pledged as collateral
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans and leases held for investment, net of deferred loan fees and costs	0
Other | Asset pledged as collateral
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans and leases held for investment, net of deferred loan fees and costs	120
Other | Mortgage Loans | Multi-family | Asset pledged as collateral
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans and leases held for investment, net of deferred loan fees and costs	0
Other | Mortgage Loans | Commercial real estate | Asset pledged as collateral
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans and leases held for investment, net of deferred loan fees and costs	0
Other | Mortgage Loans | One-to-four family first mortgage | Asset pledged as collateral
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans and leases held for investment, net of deferred loan fees and costs	0
Other | Other Loans: | Commercial and industrial | Asset pledged as collateral
Financial Instruments Owned and Pledged as Collateral [Line Items]
Loans and leases held for investment, net of deferred loan fees and costs	$ 120

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

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-5

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