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Loans and Leases - Components (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans and leases held for investment | $ 62,661 |  | $ 68,272 |  |  |
Allowance for credit losses on loans and leases | (1,071) | $ (1,106) | (1,201) | $ (1,264) | $ (1,268) | $ (992)
Total loans and leases held for investment, net | 61,590 |  | 67,071 |  |  |
Loans held for sale | 535 |  | 899 |  |  |
Total loans and leases, net | $ 62,125 |  | $ 67,970 |  |  |
Percent of loans held for investment | 100.00% |  | 100.00% |  |  |
Unearned income | $ (137) |  | $ (169) |  |  |
Accrued interest receivable | $ 260 |  | $ 277 |  |  |
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Other assets |  | Other assets |  |  |
Asset Pledged as Collateral |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans and leases held for investment | $ 32,300 |  | $ 44,600 |  |  |
Loans and leases held for investment: | Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans and leases held for investment | 30,466 |  | 34,093 |  |  |
Allowance for credit losses on loans and leases | $ (558) | (538) | $ (639) | (624) | (618) | (307)
Percent of loans held for investment | 48.70% |  | 49.90% |  |  |
Loans and leases held for investment: | Commercial real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans and leases held for investment | $ 10,163 |  | $ 11,836 |  |  |
Allowance for credit losses on loans and leases | $ (255) | (318) | $ (304) | (342) | (371) | (402)
Percent of loans held for investment | 16.20% |  | 17.40% |  |  |
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 | $ 5,513 |  | $ 5,201 |  |  |
Allowance for credit losses on loans and leases | $ (34) | (33) | $ (39) | (42) | (40) | (47)
Percent of loans held for investment | 8.80% |  | 7.60% |  |  |
Loans and leases held for investment: | Commercial and Industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans and leases held for investment | $ 14,874 |  | $ 15,376 |  |  |
Other loans held for investment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans and leases | (67) | (57) | (68) | (69) | (66) | (102)
Other loans held for investment | Commercial and Industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans and leases held for investment | 14,874 |  | 15,376 |  |  |
Allowance for credit losses on loans and leases | $ (157) | $ (160) | $ (151) | $ (187) | $ (173) | $ (134)
Percent of loans held for investment | 23.70% |  | 22.50% |  |  |
Other loans held for investment | Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans and leases held for investment | $ 1,645 |  | $ 1,766 |  |  |
Percent of loans held for investment | 2.60% |  | 2.60% |  |  |
Other loans held for investment | Lease financing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans and leases held for investment | $ 1,800 |  | $ 2,100 |  |  |

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