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Loans and Leases - Components (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans and leases held for investment | $ 71,116 |  | $ 84,619 |  |  |
Allowance for credit losses on loans and leases | (1,264) | $ (1,268) | (992) | $ (619) | $ (594) | $ (393)
Total loans and leases held for investment, net | 69,852 |  | 83,627 |  |  |
Loans held for sale, at fair value | 1,851 |  | 1,182 |  |  |
Total loans and leases, net | $ 71,703 |  | $ 84,809 |  |  |
Percent of loans held for investment | 100.00% |  | 100.00% |  |  |
Unearned income | $ 193 |  | $ 258 |  |  |
Accrued interest receivable | $ 304 |  | $ 423 |  |  |
Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of loans held for investment | 49.40% |  | 44.00% |  |  |
Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of loans held for investment | 13.00% |  | 12.40% |  |  |
One-to-four family first mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of loans held for investment | 7.40% |  | 7.20% |  |  |
Acquisition, development, and construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of loans held for investment | 4.60% |  | 3.40% |  |  |
Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of loans held for investment | 19.70% |  | 26.10% |  |  |
Lease financing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percent of loans held for investment | 3.40% |  | 3.80% |  |  |
Loans and Leases Held for Investment: | Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans and leases held for investment | $ 35,140 |  | $ 37,265 |  |  |
Allowance for credit losses on loans and leases | (624) | (618) | (307) | (184) | (192) | (178)
Loans and Leases Held for Investment: | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans and leases held for investment | 9,217 |  | 10,470 |  |  |
Allowance for credit losses on loans and leases | (292) | (328) | (366) | (120) | (69) | (46)
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 | 5,247 |  | 6,061 |  |  |
Allowance for credit losses on loans and leases | (42) | (40) | (47) | (43) | (45) | (46)
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 | 3,265 |  | 2,912 |  |  |
Allowance for credit losses on loans and leases | (50) | (43) | (36) | (31) | (23) | (20)
Loans and Leases Held for Investment: | Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans and leases held for investment | 14,045 |  | 22,065 |  |  |
Loans and Leases Held for Investment: | Lease financing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans and leases held for investment | 2,429 |  | 3,189 |  |  |
Other loans held for investment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans and leases | (256) | $ (239) | (236) | $ (241) | $ (265) | $ (103)
Other loans held for investment | Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans and leases held for investment | 16,474 |  | 25,254 |  |  |
Other loans held for investment | Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans and leases held for investment | $ 1,773 |  | $ 2,657 |  |  |
Percent of loans held for investment | 2.50% |  | 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 | $ 4,600 |  | $ 5,200 |  |  |

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