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Loans and Leases - Components (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 68,272 | $ 84,619 |  |
Allowance for credit losses on loans and leases | (1,201) | (992) | $ (393) | $ (199)
Total loans and leases held for investment, net | 67,071 | 83,627 |  |
Loans held for sale, at fair value | 899 | 1,182 |  |
Total loans and leases, net | $ 67,970 | $ 84,809 |  |
Percent of Loans Held for Investment | 100.00% | 100.00% |  |
Less: unearned income | $ (169) | $ (258) |  |
Accrued interest receivable | $ 277 | $ 423 |  |
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Other assets | Other assets |  |
Loans held for investment | Multi-family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 34,093 | $ 37,265 |  |
Allowance for credit losses on loans and leases | $ (639) | $ (307) | (178) | (159)
Percent of Loans Held for Investment | 49.90% | 44.00% |  |
Loans held for investment | Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 8,685 | $ 10,470 |  |
Allowance for credit losses on loans and leases | $ (260) | $ (366) | (47) | (17)
Percent of Loans Held for Investment | 12.70% | 12.40% |  |
Loans held for investment | One-to-four family first mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 5,201 | $ 6,061 |  |
Percent of Loans Held for Investment | 7.60% | 7.20% |  |
Loans held for investment | Acquisition, development, and construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 3,151 | $ 2,912 |  |
Allowance for credit losses on loans and leases | $ (44) | $ (36) | (20) | (3)
Percent of Loans Held for Investment | 4.60% | 3.40% |  |
Loans held for investment | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 15,376 | $ 25,254 |  |
Other loans held for investment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Allowance for credit losses on loans and leases | (219) | (236) | $ (102) | $ (20)
Other loans held for investment | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 13,260 | $ 22,065 |  |
Percent of Loans Held for Investment | 19.40% | 26.10% |  |
Other loans held for investment | Lease financing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 2,116 | $ 3,189 |  |
Percent of Loans Held for Investment | 3.10% | 3.80% |  |
Other loans held for investment | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 1,766 | $ 2,657 |  |
Percent of Loans Held for Investment | 2.60% | 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 | $ 3,900 | $ 5,200 |  |
Other loans held for investment | Warehouse Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment |  | $ 5,100 |  |

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