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Loans Receivable and Allowance for Credit Losses - Composition of Loans Held-for-Investment (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Jan. 01, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | $ 52,210,782 |  | $ 48,202,430 |  |
Allowance for loan losses | (668,743) | $ (601,673) | (595,645) | $ (541,579) | $ (619,983)
Loans held for investment, net | 51,542,039 |  | 47,606,785 |  |
Net deferred loan fees and net unamortized premiums | (71,000) |  | (70,000) |  |
Commercial Lending |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | 37,045,191 |  | 34,780,453 |  |
Commercial Lending | C&I |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | 16,581,079 |  | 15,711,095 |  |
Allowance for loan losses | (392,685) | (377,383) | (371,700) | (338,252) | (398,040)
Commercial Lending | CRE |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | 14,777,081 |  | 13,857,870 |  |
Allowance for loan losses | (170,592) | (150,201) | (149,864) | (150,940) | (163,791)
Commercial Lending | Residential loan | Multifamily Residential |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | 5,023,163 |  | 4,573,068 |  |
Allowance for loan losses | (34,375) | (23,379) | (23,373) | (14,400) | (27,573)
Commercial Lending | Construction and land |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | 663,868 |  | 638,420 |  |
Allowance for loan losses | (10,469) | (9,109) | (9,109) | (15,468) | (10,239)
Commercial Lending | Total CRE |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | 20,464,112 |  | 19,069,358 |  |
Consumer Lending |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | 15,165,591 |  | 13,421,977 |  |
Consumer Lending | Residential loan | Single-Family Residential |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | 13,383,060 |  | 11,223,027 |  |
Allowance for loan losses | (55,018) | (35,565) | (35,564) | (17,160) | (15,520)
Consumer Lending | HELOCs |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | 1,722,204 |  | 2,122,655 |  |
Allowance for loan losses | (3,947) | (4,476) | (4,475) | (3,435) | (2,690)
Consumer Lending | Total residential mortgage |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | 15,105,264 |  | 13,345,682 |  |
Consumer Lending | Other consumer |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | 60,327 |  | 76,295 |  |
Allowance for loan losses | $ (1,657) | $ (1,560) | $ (1,560) | $ (1,924) | $ (2,130)

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