Loans Receivable and Allowance for Credit Losses - Schedule Of Activity In The Allowance For Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Allowance for loan losses
Allowance for loan losses, beginning of period	$ 734,856	$ 670,280	$ 702,052	$ 668,743	$ 668,743
Provision for (reversal of) credit losses on loans	40,156	36,762	88,218	60,916
Gross charge-offs	(16,464)	(25,322)	(33,447)	(50,006)
Gross recoveries	1,813	2,187	3,515	4,294
Total net (charge-offs) recoveries	(14,651)	(23,135)	(29,932)	(45,712)
Foreign currency translation adjustment	55	(113)	78	(153)
Allowance for loan losses, end of period	760,416	683,794	760,416	683,794	702,052
Commercial lending | C&I
Allowance for loan losses
Allowance for loan losses, beginning of period	421,288	373,631	384,319	392,685	392,685
Provision for (reversal of) credit losses on loans	27,595	17,783	63,965	18,057
Gross charge-offs	(8,151)	(13,134)	(9,139)	(34,132)
Gross recoveries	1,504	1,817	3,068	3,527
Total net (charge-offs) recoveries	(6,647)	(11,317)	(6,071)	(30,605)
Foreign currency translation adjustment	55	(113)	78	(153)
Allowance for loan losses, end of period	442,291	379,984	442,291	379,984	384,319
Commercial lending | CRE
Allowance for loan losses
Allowance for loan losses, beginning of period	212,899	187,460	218,677	170,592	170,592
Provision for (reversal of) credit losses on loans	8,007	18,287	16,112	37,419
Gross charge-offs	(8,306)	(11,103)	(22,243)	(13,501)
Gross recoveries	18	150	72	284
Total net (charge-offs) recoveries	(8,288)	(10,953)	(22,171)	(13,217)
Foreign currency translation adjustment	0	0	0	0
Allowance for loan losses, end of period	212,618	194,794	212,618	194,794	218,677
Commercial lending | Multifamily Residential
Allowance for loan losses
Allowance for loan losses, beginning of period	32,324	37,418	32,117	34,375	34,375
Provision for (reversal of) credit losses on loans	(3,274)	2,628	(3,073)	5,660
Gross charge-offs	(3)	0	(7)	(6)
Gross recoveries	26	208	36	225
Total net (charge-offs) recoveries	23	208	29	219
Foreign currency translation adjustment	0	0	0	0
Allowance for loan losses, end of period	29,073	40,254	29,073	40,254	32,117
Commercial lending | Construction and Land
Allowance for loan losses
Allowance for loan losses, beginning of period	15,199	10,819	17,497	10,469	10,469
Provision for (reversal of) credit losses on loans	2,654	4,422	2,349	5,803
Gross charge-offs	0	(920)	(1,996)	(2,144)
Gross recoveries	3	1	6	194
Total net (charge-offs) recoveries	3	(919)	(1,990)	(1,950)
Foreign currency translation adjustment	0	0	0	0
Allowance for loan losses, end of period	17,856	14,322	17,856	14,322	17,497
Consumer lending | Single-Family Residential
Allowance for loan losses
Allowance for loan losses, beginning of period	46,929	55,922	44,816	55,018	55,018
Provision for (reversal of) credit losses on loans	5,064	(6,366)	7,136	(5,467)
Gross charge-offs	0	(35)	(9)	(35)
Gross recoveries	4	2	54	7
Total net (charge-offs) recoveries	4	(33)	45	(28)
Foreign currency translation adjustment	0	0	0	0
Allowance for loan losses, end of period	51,997	49,523	51,997	49,523	44,816
Consumer lending | HELOCs
Allowance for loan losses
Allowance for loan losses, beginning of period	4,879	3,563	3,132	3,947	3,947
Provision for (reversal of) credit losses on loans	369	(232)	2,108	(664)
Gross charge-offs	0	0	0	0
Gross recoveries	8	9	16	57
Total net (charge-offs) recoveries	8	9	16	57
Foreign currency translation adjustment	0	0	0	0
Allowance for loan losses, end of period	5,256	3,340	5,256	3,340	3,132
Consumer lending | Other Consumer
Allowance for loan losses
Allowance for loan losses, beginning of period	1,338	1,467	1,494	1,657	1,657
Provision for (reversal of) credit losses on loans	(259)	240	(379)	108
Gross charge-offs	(4)	(130)	(53)	(188)
Gross recoveries	250	0	263	0
Total net (charge-offs) recoveries	246	(130)	210	(188)
Foreign currency translation adjustment	0	0	0	0
Allowance for loan losses, end of period	$ 1,325	$ 1,577	$ 1,325	$ 1,577	$ 1,494