Loans Receivable and Allowance for Credit Losses - Schedule Of Activity In The Allowance For Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Allowance for loan losses
Allowance for loan losses, start of period	$ 668,743	$ 595,645	$ 541,579
Provision for (reversal of) credit losses on loans	172,176	113,571	74,767
Gross charge-offs	(146,257)	(54,372)	(37,920)
Gross recoveries	7,639	8,118	19,461
Total net (charge-offs) recoveries	(138,618)	(46,254)	(18,459)
Foreign currency translation adjustments	(249)	(247)	(2,242)
Allowance for loan losses, end of period	702,052	668,743	595,645
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2022-02
Allowance for loan losses
Allowance for loan losses, start of period		6,028
Allowance for loan losses, end of period			6,028
Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses
Allowance for loan losses, start of period		601,673
Allowance for loan losses, end of period			601,673
Commercial Lending | C&I
Allowance for loan losses
Allowance for loan losses, start of period	392,685	371,700	338,252
Provision for (reversal of) credit losses on loans	110,791	45,319	37,604
Gross charge-offs	(125,413)	(36,573)	(18,738)
Gross recoveries	6,505	6,803	16,824
Total net (charge-offs) recoveries	(118,908)	(29,770)	(1,914)
Foreign currency translation adjustments	(249)	(247)	(2,242)
Allowance for loan losses, end of period	384,319	392,685	371,700
Commercial Lending | C&I | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2022-02
Allowance for loan losses
Allowance for loan losses, start of period		5,683
Allowance for loan losses, end of period			5,683
Commercial Lending | C&I | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses
Allowance for loan losses, start of period		377,383
Allowance for loan losses, end of period			377,383
Commercial Lending | CRE
Allowance for loan losses
Allowance for loan losses, start of period	170,592	149,864	150,940
Provision for (reversal of) credit losses on loans	61,908	27,007	8,212
Gross charge-offs	(14,236)	(7,048)	(10,871)
Gross recoveries	413	432	1,583
Total net (charge-offs) recoveries	(13,823)	(6,616)	(9,288)
Foreign currency translation adjustments	0	0	0
Allowance for loan losses, end of period	218,677	170,592	149,864
Commercial Lending | CRE | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2022-02
Allowance for loan losses
Allowance for loan losses, start of period		337
Allowance for loan losses, end of period			337
Commercial Lending | CRE | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses
Allowance for loan losses, start of period		150,201
Allowance for loan losses, end of period			150,201
Commercial Lending | Multifamily Residential
Allowance for loan losses
Allowance for loan losses, start of period	34,375	23,373	14,400
Provision for (reversal of) credit losses on loans	(2,684)	10,454	15,651
Gross charge-offs	(10)	(3)	(7,237)
Gross recoveries	436	545	559
Total net (charge-offs) recoveries	426	542	(6,678)
Foreign currency translation adjustments	0	0	0
Allowance for loan losses, end of period	32,117	34,375	23,373
Commercial Lending | Multifamily Residential | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2022-02
Allowance for loan losses
Allowance for loan losses, start of period		6
Allowance for loan losses, end of period			6
Commercial Lending | Multifamily Residential | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses
Allowance for loan losses, start of period		23,379
Allowance for loan losses, end of period			23,379
Commercial Lending | Construction and land
Allowance for loan losses
Allowance for loan losses, start of period	10,469	9,109	15,468
Provision for (reversal of) credit losses on loans	9,114	11,537	(6,433)
Gross charge-offs	(2,289)	(10,413)	0
Gross recoveries	203	236	74
Total net (charge-offs) recoveries	(2,086)	(10,177)	74
Foreign currency translation adjustments	0	0	0
Allowance for loan losses, end of period	17,497	10,469	9,109
Commercial Lending | Construction and land | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2022-02
Allowance for loan losses
Allowance for loan losses, start of period		0
Allowance for loan losses, end of period			0
Commercial Lending | Construction and land | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses
Allowance for loan losses, start of period		9,109
Allowance for loan losses, end of period			9,109
Consumer Lending | Single-Family Residential
Allowance for loan losses
Allowance for loan losses, start of period	55,018	35,564	17,160
Provision for (reversal of) credit losses on loans	(10,176)	19,384	18,867
Gross charge-offs	(35)	0	(775)
Gross recoveries	9	69	312
Total net (charge-offs) recoveries	(26)	69	(463)
Foreign currency translation adjustments	0	0	0
Allowance for loan losses, end of period	44,816	55,018	35,564
Consumer Lending | Single-Family Residential | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2022-02
Allowance for loan losses
Allowance for loan losses, start of period		1
Allowance for loan losses, end of period			1
Consumer Lending | Single-Family Residential | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses
Allowance for loan losses, start of period		35,565
Allowance for loan losses, end of period			35,565
Consumer Lending | HELOCs
Allowance for loan losses
Allowance for loan losses, start of period	3,947	4,475	3,435
Provision for (reversal of) credit losses on loans	(873)	(424)	1,124
Gross charge-offs	(15)	(138)	(193)
Gross recoveries	73	33	109
Total net (charge-offs) recoveries	58	(105)	(84)
Foreign currency translation adjustments	0	0	0
Allowance for loan losses, end of period	3,132	3,947	4,475
Consumer Lending | HELOCs | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2022-02
Allowance for loan losses
Allowance for loan losses, start of period		1
Allowance for loan losses, end of period			1
Consumer Lending | HELOCs | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses
Allowance for loan losses, start of period		4,476
Allowance for loan losses, end of period			4,476
Consumer Lending | Other consumer
Allowance for loan losses
Allowance for loan losses, start of period	1,657	1,560	1,924
Provision for (reversal of) credit losses on loans	4,096	294	(258)
Gross charge-offs	(4,259)	(197)	(106)
Gross recoveries	0	0	0
Total net (charge-offs) recoveries	(4,259)	(197)	(106)
Foreign currency translation adjustments	0	0	0
Allowance for loan losses, end of period	$ 1,494	1,657	1,560
Consumer Lending | Other consumer | Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2022-02
Allowance for loan losses
Allowance for loan losses, start of period		0
Allowance for loan losses, end of period			0
Consumer Lending | Other consumer | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for loan losses
Allowance for loan losses, start of period		$ 1,560
Allowance for loan losses, end of period			$ 1,560