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Loans Receivable and Allowance for Credit Losses (Summary of Activities in Allowance for Loan Losses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period | $ 585,724 | $ 632,071 | $ 619,983 | $ 358,287
(Reversal of) provision for credit losses on loans | (11,736) | 9,889 | (19,459) | 178,845
Gross charge-offs | (18,979) | (26,649) | (49,938) | (60,555)
Gross recoveries | 5,465 | 2,441 | 9,743 | 16,209
Total net recoveries (charge-offs) | (13,514) | (24,208) | (40,195) | (44,346)
Foreign currency translation adjustment | (70) | 500 | 75 | 308
Allowance for loan losses, end of period | 560,404 | 618,252 | 560,404 | 618,252
Cumulative Effect, Period Of Adoption, Adjustment | ASU 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period |  |  |  | 125,158
Cumulative Effect, Period of Adoption, Adjusted Balance | ASU 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period |  |  |  | 483,445
Commercial lending | Commercial and industrial (“C&I”) |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period | 362,528 | 380,723 | 398,040 | 238,376
(Reversal of) provision for credit losses on loans | (23,365) | 31,691 | (42,112) | 130,171
Gross charge-offs | (1,154) | (25,111) | (20,162) | (57,466)
Gross recoveries | 4,203 | 1,218 | 6,301 | 3,395
Total net recoveries (charge-offs) | 3,049 | (23,893) | (13,861) | (54,071)
Foreign currency translation adjustment | (70) | 500 | 75 | 308
Allowance for loan losses, end of period | 342,142 | 389,021 | 342,142 | 389,021
Commercial lending | Commercial and industrial (“C&I”) | Cumulative Effect, Period Of Adoption, Adjustment | ASU 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period |  |  |  | 74,237
Commercial lending | Commercial and industrial (“C&I”) | Cumulative Effect, Period of Adoption, Adjusted Balance | ASU 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period |  |  |  | 312,613
Commercial lending | Commercial real estate (“CRE”) |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period | 161,962 | 176,040 | 163,791 | 40,509
(Reversal of) provision for credit losses on loans | 2,129 | (8,301) | 11,227 | 46,449
Gross charge-offs | (14,229) | (1,414) | (25,558) | (2,688)
Gross recoveries | 187 | 485 | 589 | 10,371
Total net recoveries (charge-offs) | (14,042) | (929) | (24,969) | 7,683
Foreign currency translation adjustment | 0 | 0 | 0 | 0
Allowance for loan losses, end of period | 150,049 | 166,810 | 150,049 | 166,810
Commercial lending | Commercial real estate (“CRE”) | Cumulative Effect, Period Of Adoption, Adjustment | ASU 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period |  |  |  | 72,169
Commercial lending | Commercial real estate (“CRE”) | Cumulative Effect, Period of Adoption, Adjusted Balance | ASU 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period |  |  |  | 112,678
Commercial lending | Residential loan | Multifamily residential |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period | 21,925 | 25,058 | 27,573 | 22,826
(Reversal of) provision for credit losses on loans | (2,660) | (1,916) | (9,436) | 7,273
Gross charge-offs | 0 | 0 | (130) | 0
Gross recoveries | 652 | 665 | 1,910 | 1,820
Total net recoveries (charge-offs) | 652 | 665 | 1,780 | 1,820
Foreign currency translation adjustment | 0 | 0 | 0 | 0
Allowance for loan losses, end of period | 19,917 | 23,807 | 19,917 | 23,807
Commercial lending | Residential loan | Multifamily residential | Cumulative Effect, Period Of Adoption, Adjustment | ASU 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period |  |  |  | (8,112)
Commercial lending | Residential loan | Multifamily residential | Cumulative Effect, Period of Adoption, Adjusted Balance | ASU 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period |  |  |  | 14,714
Commercial lending | Construction and land |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period | 15,643 | 18,551 | 10,239 | 19,404
(Reversal of) provision for credit losses on loans | 9,058 | (8,180) | 14,407 | 828
Gross charge-offs | (2,674) | 0 | (2,954) | 0
Gross recoveries | 267 | 30 | 602 | 58
Total net recoveries (charge-offs) | (2,407) | 30 | (2,352) | 58
Foreign currency translation adjustment | 0 | 0 | 0 | 0
Allowance for loan losses, end of period | 22,294 | 10,401 | 22,294 | 10,401
Commercial lending | Construction and land | Cumulative Effect, Period Of Adoption, Adjustment | ASU 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period |  |  |  | (9,889)
Commercial lending | Construction and land | Cumulative Effect, Period of Adoption, Adjusted Balance | ASU 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period |  |  |  | 9,515
Consumer lending | Residential loan | Single-family residential |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period | 16,530 | 25,314 | 15,520 | 28,527
(Reversal of) provision for credit losses on loans | 2,537 | (2,692) | 3,522 | (2,659)
Gross charge-offs | (912) | 0 | (1,046) | 0
Gross recoveries | 137 | 0 | 296 | 424
Total net recoveries (charge-offs) | (775) | 0 | (750) | 424
Foreign currency translation adjustment | 0 | 0 | 0 | 0
Allowance for loan losses, end of period | 18,292 | 22,622 | 18,292 | 22,622
Consumer lending | Residential loan | Single-family residential | Cumulative Effect, Period Of Adoption, Adjustment | ASU 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period |  |  |  | (3,670)
Consumer lending | Residential loan | Single-family residential | Cumulative Effect, Period of Adoption, Adjusted Balance | ASU 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period |  |  |  | 24,857
Consumer lending | HELOCs |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period | 2,938 | 3,867 | 2,690 | 5,265
(Reversal of) provision for credit losses on loans | 435 | (637) | 707 | (20)
Gross charge-offs | 0 | 0 | (45) | (221)
Gross recoveries | 19 | 43 | 40 | 47
Total net recoveries (charge-offs) | 19 | 43 | (5) | (174)
Foreign currency translation adjustment | 0 | 0 | 0 | 0
Allowance for loan losses, end of period | 3,392 | 3,273 | 3,392 | 3,273
Consumer lending | HELOCs | Cumulative Effect, Period Of Adoption, Adjustment | ASU 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period |  |  |  | (1,798)
Consumer lending | HELOCs | Cumulative Effect, Period of Adoption, Adjusted Balance | ASU 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period |  |  |  | 3,467
Consumer lending | Other consumer |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period | 4,198 | 2,518 | 2,130 | 3,380
(Reversal of) provision for credit losses on loans | 130 | (76) | 2,226 | (3,197)
Gross charge-offs | (10) | (124) | (43) | (180)
Gross recoveries | 0 | 0 | 5 | 94
Total net recoveries (charge-offs) | (10) | (124) | (38) | (86)
Foreign currency translation adjustment | 0 | 0 | 0 | 0
Allowance for loan losses, end of period | $ 4,318 | $ 2,318 | $ 4,318 | 2,318
Consumer lending | Other consumer | Cumulative Effect, Period Of Adoption, Adjustment | ASU 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period |  |  |  | 2,221
Consumer lending | Other consumer | Cumulative Effect, Period of Adoption, Adjusted Balance | ASU 2016-13 |  |  |  |
Allowance for loan losses |  |  |  |
Allowance for loan losses, beginning of period |  |  |  | $ 5,601

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