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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
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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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