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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Allowance for loan losses |  |  |
Allowance for loan losses, December 31, 2022 |  | $ 595,645 |
Allowance for loan losses, balance at the beginning of the period | $ 595,645 | 541,579 | $ 619,983
Provision for (reversal of) credit losses | 113,571 | 74,767 | (28,954)
Gross charge-offs | (54,372) | (37,920) | (66,592)
Gross recoveries | 8,118 | 19,461 | 16,614
Total net (charge-offs) recoveries | (46,254) | (18,459) | (49,978)
Foreign currency translation adjustment | (247) | (2,242) | 528
Allowance for loan losses, balance at the end of the period | 668,743 | 595,645 | 541,579
Accounting Standards Update 2022-02 |  |  |
Allowance for loan losses |  |  |
Impact of ASU 2022-02 adoption |  | 6,028 |
Allowance for loan losses, balance at the beginning of the period | (6,000) |  |
Allowance for loan losses, balance at the end of the period |  | (6,000) |
Commercial Lending | C&I |  |  |
Allowance for loan losses |  |  |
Allowance for loan losses, December 31, 2022 |  | 371,700 |
Allowance for loan losses, balance at the beginning of the period | 371,700 | 338,252 | 398,040
Provision for (reversal of) credit losses | 45,319 | 37,604 | (39,732)
Gross charge-offs | (36,573) | (18,738) | (32,490)
Gross recoveries | 6,803 | 16,824 | 11,906
Total net (charge-offs) recoveries | (29,770) | (1,914) | (20,584)
Foreign currency translation adjustment | (247) | (2,242) | 528
Allowance for loan losses, balance at the end of the period | 392,685 | 371,700 | 338,252
Commercial Lending | C&I | Accounting Standards Update 2022-02 |  |  |
Allowance for loan losses |  |  |
Impact of ASU 2022-02 adoption |  | 5,683 |
Commercial Lending | CRE |  |  |
Allowance for loan losses |  |  |
Allowance for loan losses, December 31, 2022 |  | 149,864 |
Allowance for loan losses, balance at the beginning of the period | 149,864 | 150,940 | 163,791
Provision for (reversal of) credit losses | 27,007 | 8,212 | 14,282
Gross charge-offs | (7,048) | (10,871) | (28,430)
Gross recoveries | 432 | 1,583 | 1,297
Total net (charge-offs) recoveries | (6,616) | (9,288) | (27,133)
Foreign currency translation adjustment | 0 | 0 | 0
Allowance for loan losses, balance at the end of the period | 170,592 | 149,864 | 150,940
Commercial Lending | CRE | Accounting Standards Update 2022-02 |  |  |
Allowance for loan losses |  |  |
Impact of ASU 2022-02 adoption |  | 337 |
Commercial Lending | Residential loan | Multifamily Residential |  |  |
Allowance for loan losses |  |  |
Allowance for loan losses, December 31, 2022 |  | 23,373 |
Allowance for loan losses, balance at the beginning of the period | 23,373 | 14,400 | 27,573
Provision for (reversal of) credit losses | 10,454 | 15,651 | (15,076)
Gross charge-offs | (3) | (7,237) | (130)
Gross recoveries | 545 | 559 | 2,033
Total net (charge-offs) recoveries | 542 | (6,678) | 1,903
Foreign currency translation adjustment | 0 | 0 | 0
Allowance for loan losses, balance at the end of the period | 34,375 | 23,373 | 14,400
Commercial Lending | Residential loan | Multifamily Residential | Accounting Standards Update 2022-02 |  |  |
Allowance for loan losses |  |  |
Impact of ASU 2022-02 adoption |  | 6 |
Commercial Lending | Construction and land |  |  |
Allowance for loan losses |  |  |
Allowance for loan losses, December 31, 2022 |  | 9,109 |
Allowance for loan losses, balance at the beginning of the period | 9,109 | 15,468 | 10,239
Provision for (reversal of) credit losses | 11,537 | (6,433) | 7,576
Gross charge-offs | (10,413) | 0 | (2,954)
Gross recoveries | 236 | 74 | 607
Total net (charge-offs) recoveries | (10,177) | 74 | (2,347)
Foreign currency translation adjustment | 0 | 0 | 0
Allowance for loan losses, balance at the end of the period | 10,469 | 9,109 | 15,468
Commercial Lending | Construction and land | Accounting Standards Update 2022-02 |  |  |
Allowance for loan losses |  |  |
Impact of ASU 2022-02 adoption |  | 0 |
Consumer Lending | Residential loan | Single-Family Residential |  |  |
Allowance for loan losses |  |  |
Allowance for loan losses, December 31, 2022 |  | 35,564 |
Allowance for loan losses, balance at the beginning of the period | 35,564 | 17,160 | 15,520
Provision for (reversal of) credit losses | 19,384 | 18,867 | 1,965
Gross charge-offs | 0 | (775) | (1,046)
Gross recoveries | 69 | 312 | 721
Total net (charge-offs) recoveries | 69 | (463) | (325)
Foreign currency translation adjustment | 0 | 0 | 0
Allowance for loan losses, balance at the end of the period | 55,018 | 35,564 | 17,160
Consumer Lending | Residential loan | Single-Family Residential | Accounting Standards Update 2022-02 |  |  |
Allowance for loan losses |  |  |
Impact of ASU 2022-02 adoption |  | 1 |
Consumer Lending | HELOCs |  |  |
Allowance for loan losses |  |  |
Allowance for loan losses, December 31, 2022 |  | 4,475 |
Allowance for loan losses, balance at the beginning of the period | 4,475 | 3,435 | 2,690
Provision for (reversal of) credit losses | (424) | 1,124 | 745
Gross charge-offs | (138) | (193) | (45)
Gross recoveries | 33 | 109 | 45
Total net (charge-offs) recoveries | (105) | (84) | 0
Foreign currency translation adjustment | 0 | 0 | 0
Allowance for loan losses, balance at the end of the period | 3,947 | 4,475 | 3,435
Consumer Lending | HELOCs | Accounting Standards Update 2022-02 |  |  |
Allowance for loan losses |  |  |
Impact of ASU 2022-02 adoption |  | 1 |
Consumer Lending | Other consumer |  |  |
Allowance for loan losses |  |  |
Allowance for loan losses, December 31, 2022 |  | 1,560 |
Allowance for loan losses, balance at the beginning of the period | 1,560 | 1,924 | 2,130
Provision for (reversal of) credit losses | 294 | (258) | 1,286
Gross charge-offs | (197) | (106) | (1,497)
Gross recoveries | 0 | 0 | 5
Total net (charge-offs) recoveries | (197) | (106) | (1,492)
Foreign currency translation adjustment | 0 | 0 | 0
Allowance for loan losses, balance at the end of the period | $ 1,657 | 1,560 | $ 1,924
Consumer Lending | Other consumer | Accounting Standards Update 2022-02 |  |  |
Allowance for loan losses |  |  |
Impact of ASU 2022-02 adoption |  | $ 0 |

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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 + Details
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