LOANS AND LEASES RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LEASES - Schedule of Allowance for Credit Losses (Detail) - 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
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 141,076	$ 133,296	$ 136,775	$ 135,311	$ 135,311
Allowance for credit losses on FDIC PCD loans, net of charge-offs	1,000		1,000
Charge-offs	(17,163)	(22,724)	(37,926)	(45,551)	(84,465)
Recoveries	4,048	4,013	7,667	8,872
Provision (benefit) for credit losses on loans and leases	18,457	17,851	39,902	33,804
Ending balance	147,418	132,436	147,418	132,436	136,775
Commercial and industrial, including specialized lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	30,584	23,003	29,379	23,503	23,503
Allowance for credit losses on FDIC PCD loans, net of charge-offs	1,000		1,000
Charge-offs	(5,996)	(7,348)	(10,503)	(12,744)
Recoveries	2,125	1,683	3,401	3,407
Provision (benefit) for credit losses on loans and leases	8,549	6,383	12,985	9,555
Ending balance	36,262	23,721	36,262	23,721	29,379
Allowance for credit losses	1,000		1,000
Multifamily
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	18,790	18,307	18,511	16,343	16,343
Allowance for credit losses on FDIC PCD loans, net of charge-offs	0		0
Charge-offs	0	(1,433)	(3,834)	(1,906)
Recoveries	0	0	0	0
Provision (benefit) for credit losses on loans and leases	2,074	3,778	6,187	6,215
Ending balance	20,864	20,652	20,864	20,652	18,511
Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	10,780	10,201	10,755	9,882	9,882
Allowance for credit losses on FDIC PCD loans, net of charge-offs	0		0
Charge-offs	(417)	0	(436)	(22)
Recoveries	6	0	9	0
Provision (benefit) for credit losses on loans and leases	2,145	(1,770)	2,186	(1,429)
Ending balance	12,514	8,431	12,514	8,431	10,755
Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	18,058	18,320	17,405	16,859	16,859
Allowance for credit losses on FDIC PCD loans, net of charge-offs	0		0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision (benefit) for credit losses on loans and leases	2,621	(354)	3,274	1,107
Ending balance	20,679	17,966	20,679	17,966	17,405
Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,264	1,866	1,250	1,482	1,482
Allowance for credit losses on FDIC PCD loans, net of charge-offs	0		0
Charge-offs	0	0	0	0
Recoveries	3	7	6	7
Provision (benefit) for credit losses on loans and leases	893	(17)	904	367
Ending balance	2,160	1,856	2,160	1,856	1,250
Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	6,163	6,707	5,968	6,586	6,586
Allowance for credit losses on FDIC PCD loans, net of charge-offs	0		0
Charge-offs	0	0	0	(19)
Recoveries	4	20	4	21
Provision (benefit) for credit losses on loans and leases	164	(843)	359	(704)
Ending balance	6,331	5,884	6,331	5,884	5,968
Manufactured housing
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,800	4,160	3,829	4,239	4,239
Allowance for credit losses on FDIC PCD loans, net of charge-offs	0		0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision (benefit) for credit losses on loans and leases	(79)	(66)	(108)	(145)
Ending balance	3,721	4,094	3,721	4,094	3,829
Installment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	51,637	50,732	49,678	56,417	56,417
Allowance for credit losses on FDIC PCD loans, net of charge-offs	0		0
Charge-offs	(10,750)	(13,943)	(23,153)	(30,860)
Recoveries	1,910	2,303	4,247	5,437
Provision (benefit) for credit losses on loans and leases	2,090	10,740	14,115	18,838
Ending balance	$ 44,887	$ 49,832	$ 44,887	$ 49,832	$ 49,678