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Loans Receivable and Allowance for Credit Losses - Composition of Loans Held-for-Investment (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Jan. 01, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
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LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | $ 48,918,048 |  | $ 48,202,430 |  |
Allowance for loan losses | (619,893) | $ (601,673) | (595,645) | $ (545,685) | $ (541,579)
Loans held-for-investment, net | 48,298,155 |  | 47,606,785 |  |
Net deferred loan fees and net unamortized premiums | (75,400) |  | (70,400) |  |
Commercial lending |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | 35,074,650 |  | 34,780,453 |  |
Commercial lending | Commercial and industrial (“C&I”) |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | 15,641,840 |  | 15,711,095 |  |
Allowance for loan losses | (376,325) | (377,383) |  | (339,446) | (338,252)
Commercial lending | CRE |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | 14,019,136 |  | 13,857,870 |  |
Allowance for loan losses | (155,067) | (150,201) |  | (147,104) | (150,940)
Commercial lending | Real estate loan | Multifamily residential |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | 4,682,280 |  | 4,573,068 |  |
Allowance for loan losses | (24,526) | (23,379) |  | (24,176) | (14,400)
Commercial lending | Construction and land |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | 731,394 |  | 638,420 |  |
Allowance for loan losses | (9,322) | (9,109) |  | (11,016) | (15,468)
Commercial lending | Total CRE |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | 19,432,810 |  | 19,069,358 |  |
Consumer lending |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | 13,843,398 |  | 13,421,977 |  |
Consumer lending | Real estate loan | Single-family residential |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | 11,786,998 |  | 11,223,027 |  |
Allowance for loan losses | (48,007) | (35,565) |  | (18,210) | (17,160)
Consumer lending | HELOCs |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | 1,988,881 |  | 2,122,655 |  |
Allowance for loan losses | (4,971) | (4,476) |  | (3,748) | (3,435)
Consumer lending | Total residential mortgage |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | 13,775,879 |  | 13,345,682 |  |
Consumer lending | Other consumer |  |  |  |  |
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES |  |  |  |  |
Loans held-for-investment | 67,519 |  | $ 76,295 |  |
Allowance for loan losses | $ (1,675) | $ (1,560) |  | $ (1,985) | $ (1,924)

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