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Loans Receivable and Allowance for Credit Losses - Summary of Activities in Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Allowance for loan losses |  |  |  |
Allowance for loan losses, balance at the beginning of the period | $ 541,579 | $ 619,983 | $ 358,287 |
Provision for (reversal of) credit losses | 74,767 | (28,954) | 198,691 |
Gross charge-offs | (37,920) | (66,592) | (81,837) |
Gross recoveries | 19,461 | 16,614 | 18,672 |
Total net (charge-offs) recoveries | (18,459) | (49,978) | (63,165) |
Foreign currency translation adjustment | (2,242) | 528 | 1,012 |
Allowance for loan losses, balance at the end of the period | 595,645 | 541,579 | 619,983 | $ 358,287
Accounting Standards Update [Extensible List] |  |  |  | Accounting Standards Update 2016-13
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, balance at the beginning of the period |  |  | 125,158 |
Allowance for loan losses, balance at the end of the period |  |  |  | $ 125,158
Commercial Lending | C&I |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, balance at the beginning of the period | 338,252 | 398,040 | 238,376 |
Provision for (reversal of) credit losses | 37,604 | (39,732) | 145,212 |
Gross charge-offs | (18,738) | (32,490) | (66,225) |
Gross recoveries | 16,824 | 11,906 | 5,428 |
Total net (charge-offs) recoveries | (1,914) | (20,584) | (60,797) |
Foreign currency translation adjustment | (2,242) | 528 | 1,012 |
Allowance for loan losses, balance at the end of the period | 371,700 | 338,252 | 398,040 | 238,376
Commercial Lending | C&I | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, balance at the beginning of the period |  |  | 74,237 |
Allowance for loan losses, balance at the end of the period |  |  |  | 74,237
Commercial Lending | CRE |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, balance at the beginning of the period | 150,940 | 163,791 | 40,509 |
Provision for (reversal of) credit losses | 8,212 | 14,282 | 55,864 |
Gross charge-offs | (10,871) | (28,430) | (15,206) |
Gross recoveries | 1,583 | 1,297 | 10,455 |
Total net (charge-offs) recoveries | (9,288) | (27,133) | (4,751) |
Foreign currency translation adjustment | 0 | 0 | 0 |
Allowance for loan losses, balance at the end of the period | 149,864 | 150,940 | 163,791 | 40,509
Commercial Lending | CRE | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, balance at the beginning of the period |  |  | 72,169 |
Allowance for loan losses, balance at the end of the period |  |  |  | 72,169
Commercial Lending | Residential loan | Multifamily |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, balance at the beginning of the period | 14,400 | 27,573 | 22,826 |
Provision for (reversal of) credit losses | 15,651 | (15,076) | 10,879 |
Gross charge-offs | (7,237) | (130) | 0 |
Gross recoveries | 559 | 2,033 | 1,980 |
Total net (charge-offs) recoveries | (6,678) | 1,903 | 1,980 |
Foreign currency translation adjustment | 0 | 0 | 0 |
Allowance for loan losses, balance at the end of the period | 23,373 | 14,400 | 27,573 | 22,826
Commercial Lending | Residential loan | Multifamily | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, balance at the beginning of the period |  |  | (8,112) |
Allowance for loan losses, balance at the end of the period |  |  |  | (8,112)
Commercial Lending | Construction and land |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, balance at the beginning of the period | 15,468 | 10,239 | 19,404 |
Provision for (reversal of) credit losses | (6,433) | 7,576 | 644 |
Gross charge-offs | 0 | (2,954) | 0 |
Gross recoveries | 74 | 607 | 80 |
Total net (charge-offs) recoveries | 74 | (2,347) | 80 |
Foreign currency translation adjustment | 0 | 0 | 0 |
Allowance for loan losses, balance at the end of the period | 9,109 | 15,468 | 10,239 | 19,404
Commercial Lending | Construction and land | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, balance at the beginning of the period |  |  | (9,889) |
Allowance for loan losses, balance at the end of the period |  |  |  | (9,889)
Consumer Lending | Residential loan | Single-family |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, balance at the beginning of the period | 17,160 | 15,520 | 28,527 |
Provision for (reversal of) credit losses | 18,867 | 1,965 | (9,922) |
Gross charge-offs | (775) | (1,046) | 0 |
Gross recoveries | 312 | 721 | 585 |
Total net (charge-offs) recoveries | (463) | (325) | 585 |
Foreign currency translation adjustment | 0 | 0 | 0 |
Allowance for loan losses, balance at the end of the period | 35,564 | 17,160 | 15,520 | 28,527
Consumer Lending | Residential loan | Single-family | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, balance at the beginning of the period |  |  | (3,670) |
Allowance for loan losses, balance at the end of the period |  |  |  | (3,670)
Consumer Lending | HELOCs |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, balance at the beginning of the period | 3,435 | 2,690 | 5,265 |
Provision for (reversal of) credit losses | 1,124 | 745 | (605) |
Gross charge-offs | (193) | (45) | (221) |
Gross recoveries | 109 | 45 | 49 |
Total net (charge-offs) recoveries | (84) | 0 | (172) |
Foreign currency translation adjustment | 0 | 0 | 0 |
Allowance for loan losses, balance at the end of the period | 4,475 | 3,435 | 2,690 | 5,265
Consumer Lending | HELOCs | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, balance at the beginning of the period |  |  | (1,798) |
Allowance for loan losses, balance at the end of the period |  |  |  | (1,798)
Consumer Lending | Other consumer |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, balance at the beginning of the period | 1,924 | 2,130 | 3,380 |
Provision for (reversal of) credit losses | (258) | 1,286 | (3,381) |
Gross charge-offs | (106) | (1,497) | (185) |
Gross recoveries | 0 | 5 | 95 |
Total net (charge-offs) recoveries | (106) | (1,492) | (90) |
Foreign currency translation adjustment | 0 | 0 | 0 |
Allowance for loan losses, balance at the end of the period | $ 1,560 | $ 1,924 | 2,130 | 3,380
Consumer Lending | Other consumer | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, balance at the beginning of the period |  |  | $ 2,221 |
Allowance for loan losses, balance at the end of the period |  |  |  | $ 2,221

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