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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
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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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