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Loans and Leases - Components (Details) - USD ($) $ in Millions	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases held for investment	$ 74,552		$ 84,619
Allowance for credit losses on loans and leases	(1,268)	$ (1,215)	(992)	$ (594)	$ (550)	$ (393)
Total loans and leases held for investment, net	73,284		83,627
Loans held for sale, at fair value	7,845		1,182
Total loans and leases, net	$ 81,129		$ 84,809
Percent of loans held for investment	100.00%		100.00%
Unearned income	$ 218		$ 258
Accrued interest receivable	376		423
Loans and Leases Held for Investment:
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale, at fair value	6,400
Loans and Leases Held for Investment: | Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases held for investment	36,011		37,265
Allowance for credit losses on loans and leases	$ (618)	(469)	$ (307)	(192)	(171)	(178)
Percent of loans held for investment	48.30%		44.00%
Loans and Leases Held for Investment: | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases held for investment	$ 9,961		$ 10,470
Allowance for credit losses on loans and leases	$ (328)	(434)	$ (366)	(69)	(53)	(46)
Percent of loans held for investment	13.30%		12.40%
Loans and Leases Held for Investment: | One-to-four family first mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases held for investment	$ 5,790		$ 6,061
Allowance for credit losses on loans and leases	$ (40)	(42)	$ (47)	(45)	(39)	(46)
Percent of loans held for investment	7.80%		7.20%
Loans and Leases Held for Investment: | Acquisition, development, and construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases held for investment	$ 3,217		$ 2,912
Allowance for credit losses on loans and leases	$ (43)	(48)	$ (36)	(23)	(20)	(20)
Percent of loans held for investment	4.30%		3.40%
Loans and Leases Held for Investment: | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases held for investment	$ 15,088		$ 22,065
Percent of loans held for investment	20.20%		26.10%
Loans and Leases Held for Investment: | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases held for investment	$ 2,731		$ 3,189
Percent of loans held for investment	3.70%		3.80%
Other loans held for investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses on loans and leases	$ (239)	$ (222)	$ (236)	$ (265)	$ (267)	$ (103)
Other loans held for investment | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases held for investment	$ 1,754		$ 2,657
Percent of loans held for investment	2.40%		3.10%
Other loans held for investment | Specialty finance loans and leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases held for investment	$ 4,800		$ 5,200

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