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Loans Receivable and Allowance for Credit Losses - Schedule Of Composition Of Loans Held-For-Investment (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | $ 53,253,181 |  | $ 52,210,782 |  |  |
Allowance for loan losses | (696,485) | $ (683,794) | (668,743) | $ (655,523) | $ (635,400) | $ (595,645)
Loans held-for-investment, net | 52,556,696 |  | 51,542,039 |  |  |
Net deferred loan fees and net unamortized premiums | (52,000) |  | (71,000) |  |  |
Commercial lending |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 37,471,467 |  | 37,045,191 |  |  |
Commercial lending | C&I |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 17,068,002 |  | 16,581,079 |  |  |
Allowance for loan losses | (378,315) | (379,984) | (392,685) | (383,677) | (375,333) | (371,700)
Commercial lending | CRE |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 14,568,209 |  | 14,777,081 |  |  |
Allowance for loan losses | (221,244) | (194,794) | (170,592) | (178,040) | (168,505) | (149,864)
Commercial lending | Multifamily residential |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 5,141,481 |  | 5,023,163 |  |  |
Allowance for loan losses | (31,782) | (40,254) | (34,375) | (24,162) | (22,938) | (23,373)
Commercial lending | Construction and land |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 693,775 |  | 663,868 |  |  |
Allowance for loan losses | (12,208) | (14,322) | (10,469) | (9,216) | (11,325) | (9,109)
Commercial lending | Total CRE |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 20,403,465 |  | 20,464,112 |  |  |
Consumer lending |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 15,781,714 |  | 15,165,591 |  |  |
Consumer lending | Single-family residential |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 13,963,097 |  | 13,383,060 |  |  |
Allowance for loan losses | (48,231) | (49,523) | (55,018) | (54,930) | (51,513) | (35,564)
Consumer lending | HELOCs |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 1,760,716 |  | 1,722,204 |  |  |
Allowance for loan losses | (3,210) | (3,340) | (3,947) | (3,795) | (4,526) | (4,475)
Consumer lending | Total residential mortgage |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 15,723,813 |  | 15,105,264 |  |  |
Consumer lending | Other consumer |  |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |  |
Loans held-for-investment | 57,901 |  | 60,327 |  |  |
Allowance for loan losses | $ (1,495) | $ (1,577) | $ (1,657) | $ (1,703) | $ (1,260) | $ (1,560)

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