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Loans and Leases - Components (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 2021
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 83,995 | $ 69,001 |  |
Allowance for credit losses on loans and leases | (619) | (393) | $ (218) | $ (199)
Total loans and leases held for investment, net | 83,376 | 68,608 |  |
Loans held for sale, at fair value | 1,926 | 1,115 |  |
Total loans and leases, net | $ 85,302 | $ 69,723 |  |
Percent of loans held for investment | 100.00% | 100.00% |  |
Unearned income | $ 243 | $ 85 |  |
Accrued interest receivable | 405 | 292 |  |
Mortgage Loans: |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | 56,976 | 54,473 |  |
Allowance for credit losses on loans and leases | $ (379) | $ (290) | (208) | (178)
Percent of loans held for investment | 67.90% | 78.90% |  |
Mortgage Loans: | Multi-family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 37,698 | $ 38,130 |  |
Percent of loans held for investment | 44.90% | 55.30% |  |
Mortgage Loans: | Commercial real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 10,486 | $ 8,526 |  |
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 | $ 5,882 | $ 5,821 |  |
Percent of loans held for investment | 7.00% | 8.40% |  |
Mortgage Loans: | Acquisition, development, and construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 2,910 | $ 1,996 |  |
Percent of loans held for investment | 3.50% | 2.80% |  |
Other Loans: |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 27,019 | $ 14,528 |  |
Allowance for credit losses on loans and leases | $ (240) | $ (103) | $ (10) | $ (21)
Percent of loans held for investment | 32.10% | 21.10% |  |
Other Loans: | Commercial and industrial loans and lease financing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 24,423 | $ 12,276 |  |
Percent of loans held for investment | 29.00% | 17.80% |  |
Other Loans: | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 21,275 | $ 10,597 |  |
Percent of loans held for investment | 25.30% | 15.40% |  |
Other Loans: | Lease financing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total loans and leases held for investment | $ 3,148 | $ 1,679 |  |
Percent of loans held for investment | 3.70% | 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 | $ 2,596 | $ 2,252 |  |
Percent of loans held for investment | 3.10% | 3.30% |  |

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