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Loans and Leases - Components (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans and leases held for investment | $ 64,121 |  | $ 68,272 |  |  |
Allowance for credit losses on loans and leases | (1,106) | $ (1,168) | (1,201) | $ (1,268) | $ (1,215) | $ (992)
Total loans and leases held for investment, net | 63,015 |  | 67,071 |  |  |
Loans held for sale, at fair value | 319 |  | 899 |  |  |
Total loans and leases, net | $ 63,334 |  | $ 67,970 |  |  |
Percent of loans held for investment | 100.00% |  | 100.00% |  |  |
Unearned income | $ (150) |  | $ (169) |  |  |
Accrued interest receivable | $ 261 |  | $ 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 | $ 34,400 |  | $ 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 | 31,932 |  | 34,093 |  |  |
Allowance for credit losses on loans and leases | $ (538) | (609) | $ (639) | (618) | (469) | (307)
Percent of loans held for investment | 49.80% |  | 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 | $ 10,636 |  | $ 11,836 |  |  |
Allowance for credit losses on loans and leases | $ (318) | (289) | $ (304) | (371) | (482) | (402)
Percent of loans held for investment | 16.60% |  | 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 | $ 5,445 |  | $ 5,201 |  |  |
Allowance for credit losses on loans and leases | $ (33) | (37) | $ (39) | (40) | (42) | (47)
Percent of loans held for investment | 8.50% |  | 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 | $ 14,426 |  | $ 15,376 |  |  |
Other loans held for investment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses on loans and leases | (57) | (66) | (68) | (66) | (65) | (102)
Other loans held for investment | Commercial and Industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans and leases held for investment | 14,426 |  | 15,376 |  |  |
Allowance for credit losses on loans and leases | $ (160) | $ (167) | $ (151) | $ (173) | $ (157) | $ (134)
Percent of loans held for investment | 22.50% |  | 22.50% |  |  |
Other loans held for investment | Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans and leases held for investment | $ 1,682 |  | $ 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 | $ 1,900 |  | $ 2,100 |  |  |

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