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Loans and Leases - Components (Details) - USD ($) $ in Millions | 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 | $ 84,619 | $ 69,001 |
Allowance for credit losses on loans and leases | (992) | (393) | $ (199)
Total loans and leases held for investment, net | 83,627 | 68,608 |
Loans held for sale ($902 and $1,115 measured at fair value, respectively) | 1,182 | 1,115 |
Total loans and leases, net | $ 84,809 | $ 69,723 |
Percent of loans held for investment | 100.00% | 100.00% |
Unearned income | $ 258 | $ 85 |
Accrued interest receivable | $ 423 | $ 292 |
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Other assets | Other assets |
Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases held for investment | $ 27,911 | $ 14,528 |
Percent of loans held for investment | 33.00% | 21.10% |
Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases held for investment | $ 56,708 | $ 54,473 |
Allowance for credit losses on loans and leases | $ (756) | $ (290) | (178)
Percent of loans held for investment | 67.00% | 78.90% |
Mortgage Loans | Multi-family |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases held for investment | $ 37,265 | $ 38,130 |
Percent of loans held for investment | 44.00% | 55.30% |
Mortgage Loans | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases held for investment | $ 10,470 | $ 8,526 |
Percent of loans held for investment | 12.40% | 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 | $ 6,061 | $ 5,821 |
Percent of loans held for investment | 7.20% | 8.40% |
Mortgage Loans | Acquisition, development, and construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases held for investment | $ 2,912 | $ 1,996 |
Percent of loans held for investment | 3.40% | 2.80% |
Other Loans: |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases held for investment | $ 27,911 | $ 14,528 |
Allowance for credit losses on loans and leases | (236) | (103) | $ (21)
Other Loans: | Commercial and industrial loans and lease financing |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases held for investment | $ 25,254 | $ 12,276 |
Percent of loans held for investment | 29.90% | 17.80% |
Other Loans: | Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases held for investment | $ 22,065 | $ 10,597 |
Percent of loans held for investment | 26.10% | 15.40% |
Other Loans: | Lease financing |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases held for investment | $ 3,189 | $ 1,679 |
Percent of loans held for investment | 3.80% | 2.40% |
Other Loans: | Specialty finance loans and leases |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases held for investment | $ 5,200 | $ 4,400 |
Other Loans: | Other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases held for investment | $ 2,657 | $ 2,252 |
Percent of loans held for investment | 3.10% | 3.30% |

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