Loans Receivable and Allowance for Credit Losses - Schedule Of Activity In The Allowance For Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Allowance for loan losses
Allowance for loan losses, beginning of period	$ 702,052	$ 668,743	$ 668,743
Provision for (reversal of) credit losses on loans	48,062	24,154
Gross charge-offs	(16,983)	(24,684)
Gross recoveries	1,702	2,107
Total net recoveries (charge-offs)	(15,281)	(22,577)
Foreign currency translation adjustment	23	(40)
Allowance for loan losses, end of period	734,856	670,280	702,052
Commercial lending | C&I
Allowance for loan losses
Allowance for loan losses, beginning of period	384,319	392,685	392,685
Provision for (reversal of) credit losses on loans	36,370	274
Gross charge-offs	(988)	(20,998)
Gross recoveries	1,564	1,710
Total net recoveries (charge-offs)	576	(19,288)
Foreign currency translation adjustment	23	(40)
Allowance for loan losses, end of period	421,288	373,631	384,319
Commercial lending | CRE
Allowance for loan losses
Allowance for loan losses, beginning of period	218,677	170,592	170,592
Provision for (reversal of) credit losses on loans	8,105	19,132
Gross charge-offs	(13,937)	(2,398)
Gross recoveries	54	134
Total net recoveries (charge-offs)	(13,883)	(2,264)
Foreign currency translation adjustment	0	0
Allowance for loan losses, end of period	212,899	187,460	218,677
Commercial lending | Multifamily Residential
Allowance for loan losses
Allowance for loan losses, beginning of period	32,117	34,375	34,375
Provision for (reversal of) credit losses on loans	201	3,032
Gross charge-offs	(4)	(6)
Gross recoveries	10	17
Total net recoveries (charge-offs)	6	11
Foreign currency translation adjustment	0	0
Allowance for loan losses, end of period	32,324	37,418	32,117
Commercial lending | Construction and Land
Allowance for loan losses
Allowance for loan losses, beginning of period	17,497	10,469	10,469
Provision for (reversal of) credit losses on loans	(305)	1,381
Gross charge-offs	(1,996)	(1,224)
Gross recoveries	3	193
Total net recoveries (charge-offs)	(1,993)	(1,031)
Foreign currency translation adjustment	0	0
Allowance for loan losses, end of period	15,199	10,819	17,497
Consumer lending | Single-Family Residential
Allowance for loan losses
Allowance for loan losses, beginning of period	44,816	55,018	55,018
Provision for (reversal of) credit losses on loans	2,072	899
Gross charge-offs	(9)	0
Gross recoveries	50	5
Total net recoveries (charge-offs)	41	5
Foreign currency translation adjustment	0	0
Allowance for loan losses, end of period	46,929	55,922	44,816
Consumer lending | HELOCs
Allowance for loan losses
Allowance for loan losses, beginning of period	3,132	3,947	3,947
Provision for (reversal of) credit losses on loans	1,739	(432)
Gross charge-offs	0	0
Gross recoveries	8	48
Total net recoveries (charge-offs)	8	48
Foreign currency translation adjustment	0	0
Allowance for loan losses, end of period	4,879	3,563	3,132
Consumer lending | Other Consumer
Allowance for loan losses
Allowance for loan losses, beginning of period	1,494	1,657	1,657
Provision for (reversal of) credit losses on loans	(120)	(132)
Gross charge-offs	(49)	(58)
Gross recoveries	13	0
Total net recoveries (charge-offs)	(36)	(58)
Foreign currency translation adjustment	0	0
Allowance for loan losses, end of period	$ 1,338	$ 1,467	$ 1,494