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Loans Receivable and Allowance for Credit Losses - Composition of Loans Held-for-Investment (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Jan. 01, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |  |
Loans held-for-investment | $ 50,907,184 |  |  | $ 48,202,430 |  |  |
Allowance for loan losses | (655,523) | $ (635,400) | $ (601,673) | (595,645) | $ (582,517) | $ (563,270) | $ (541,579)
Loans held-for-investment, net | 50,251,661 |  |  | 47,606,785 |  |  |
Net deferred loan fees and net unamortized premiums | (72,000) |  |  | (70,400) |  |  |
Commercial lending |  |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |  |
Loans held-for-investment | 36,229,707 |  |  | 34,780,453 |  |  |
Commercial lending | Commercial and industrial (“C&I”) |  |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |  |
Loans held-for-investment | 15,864,042 |  |  | 15,711,095 |  |  |
Allowance for loan losses | (383,677) | (375,333) | (377,383) |  | (371,749) | (363,282) | (338,252)
Commercial lending | CRE |  |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |  |
Loans held-for-investment | 14,667,378 |  |  | 13,857,870 |  |  |
Allowance for loan losses | (178,040) | (168,505) | (150,201) |  | (145,301) | (140,245) | (150,940)
Commercial lending | Real estate loan | Multifamily residential |  |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |  |
Loans held-for-investment | 4,900,097 |  |  | 4,573,068 |  |  |
Allowance for loan losses | (24,162) | (22,938) | (23,379) |  | (25,680) | (26,552) | (14,400)
Commercial lending | Construction and land |  |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |  |
Loans held-for-investment | 798,190 |  |  | 638,420 |  |  |
Allowance for loan losses | (9,216) | (11,325) | (9,109) |  | (7,506) | (6,682) | (15,468)
Commercial lending | Total CRE |  |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |  |
Loans held-for-investment | 20,365,665 |  |  | 19,069,358 |  |  |
Consumer lending |  |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |  |
Loans held-for-investment | 14,677,477 |  |  | 13,421,977 |  |  |
Consumer lending | Real estate loan | Single-family residential |  |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |  |
Loans held-for-investment | 12,836,558 |  |  | 11,223,027 |  |  |
Allowance for loan losses | (54,930) | (51,513) | (35,565) |  | (27,263) | (21,840) | (17,160)
Consumer lending | HELOCs |  |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |  |
Loans held-for-investment | 1,776,665 |  |  | 2,122,655 |  |  |
Allowance for loan losses | (3,795) | (4,526) | (4,476) |  | (3,324) | (3,220) | (3,435)
Consumer lending | Total residential mortgage |  |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |  |
Loans held-for-investment | 14,613,223 |  |  | 13,345,682 |  |  |
Consumer lending | Other consumer |  |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |  |
Loans held-for-investment | 64,254 |  |  | $ 76,295 |  |  |
Allowance for loan losses | $ (1,703) | $ (1,260) | $ (1,560) |  | $ (1,694) | $ (1,449) | $ (1,924)

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