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Loans and Leases - Components (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 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 | $ 82,327 | $ 84,619 |  |
Allowance for credit losses on loans and leases | (1,215) | (992) | $ (550) | $ (393)
Total loans and leases held for investment, net | 81,112 | 83,627 |  |
Loans held for sale, at fair value | 981 | 1,182 |  |
Total loans and leases, net | $ 82,093 | $ 84,809 |  |
Percent of loans held for investment | 100.00% | 100.00% |  |
Unearned income | $ 243 | $ 258 |  |
Accrued interest receivable | 410 | 410 |  |
Mortgage Loans: |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | 56,196 | 56,708 |  |
Allowance for credit losses on loans and leases | $ (993) | $ (756) | (283) | (290)
Percent of loans held for investment | 68.30% | 67.00% |  |
Mortgage Loans: | Multi-family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 36,859 | $ 37,265 |  |
Percent of loans held for investment | 44.80% | 44.00% |  |
Mortgage Loans: | Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 10,323 | $ 10,470 |  |
Percent of loans held for investment | 12.50% | 12.40% |  |
Mortgage Loans: | One-to-four family first mortgage |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 5,807 | $ 6,061 |  |
Percent of loans held for investment | 7.10% | 7.20% |  |
Mortgage Loans: | Acquisition, development, and construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 3,207 | $ 2,912 |  |
Percent of loans held for investment | 3.90% | 3.40% |  |
Other Loans: |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 26,131 | $ 27,911 |  |
Allowance for credit losses on loans and leases | $ (222) | $ (236) | $ (267) | $ (103)
Percent of loans held for investment | 31.70% | 33.00% |  |
Other Loans: | Commercial and industrial loans and lease financing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 24,418 | $ 25,254 |  |
Percent of loans held for investment | 29.60% | 29.80% |  |
Other Loans: | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 21,428 | $ 22,065 |  |
Percent of loans held for investment | 26.00% | 26.10% |  |
Other Loans: | Lease financing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 2,990 | $ 3,189 |  |
Percent of loans held for investment | 3.60% | 3.80% |  |
Other Loans: | Specialty finance loans and leases |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 4,800 | $ 5,200 |  |
Other Loans: | Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 1,713 | $ 2,657 |  |
Percent of loans held for investment | 2.10% | 3.10% |  |

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