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Allowance for Credit Losses on Loans and Leases - Schedule of Non-Accrual Loans (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
Financing Receivable, With No Related Allowance, Average Recorded Investment	$ 1,636	$ 294
Financing Receivable,, With Related Allowance, Recorded Investment	979	134
Financing Receivable, Related Allowance	164	47
Financing Receivable, Recorded Investment	2,615	428
Loans held for investment | Multi-family
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
Financing Receivable, With No Related Allowance, Average Recorded Investment	1,092	134
Financing Receivable,, With Related Allowance, Recorded Investment	663	4
Financing Receivable, Related Allowance	77	0
Financing Receivable, Recorded Investment	1,755	138
Loans held for investment | Commercial real estate
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
Financing Receivable, With No Related Allowance, Average Recorded Investment	418	53
Financing Receivable,, With Related Allowance, Recorded Investment	128	75
Financing Receivable, Related Allowance	28	17
Financing Receivable, Recorded Investment	546	128
Loans held for investment | One-to-four family first mortgage
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
Financing Receivable, With No Related Allowance, Average Recorded Investment	61	85
Financing Receivable,, With Related Allowance, Recorded Investment	9	11
Financing Receivable, Related Allowance	1	2
Financing Receivable, Recorded Investment	70	96
Loans held for investment | Acquisition, development, and construction
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
Financing Receivable, With No Related Allowance, Average Recorded Investment	11	0
Financing Receivable,, With Related Allowance, Recorded Investment	7	0
Financing Receivable, Related Allowance	3	0
Financing Receivable, Recorded Investment	18	0
Other loans held for investment
Certain Loans Acquired in Transfer Accounted for as Debt Securities Accretable Yield Movement Schedule [Line Items]
Financing Receivable, With No Related Allowance, Average Recorded Investment	54	22
Financing Receivable,, With Related Allowance, Recorded Investment	172	44
Financing Receivable, Related Allowance	55	28
Financing Receivable, Recorded Investment	$ 226	$ 66

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