LOANS RECEIVABLE, NET - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 5,149,085		$ 4,957,273
Allowance for credit losses	(68,939)	$ (68,155)	(57,586)	$ (58,998)	$ (57,676)	$ (60,086)
Loans receivable, net	5,080,146		4,899,687
Commercial portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	3,621,446		3,366,642
Commercial portfolio \| Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	1,307,075		1,334,794
Allowance for credit losses	(11,737)	(11,279)	(13,276)	(17,019)	(15,322)	(13,505)
Commercial portfolio \| Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	1,861,575		1,643,779
Allowance for credit losses	(17,824)	(16,872)	(4,792)	(2,757)	(3,151)	(2,794)
Commercial portfolio \| Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	436,144		363,266
Allowance for credit losses	(1,923)	(1,697)	(1,779)	(2,087)	(1,589)	(1,600)
Commercial portfolio \| Construction and land development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	16,652		24,803
Allowance for credit losses	(12)	(1,463)	(1,506)	(1,286)	(1,252)	(1,253)
Retail portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	1,527,639		1,590,631
Retail portfolio \| Residential real estate lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	1,199,552		1,237,791
Allowance for credit losses	(6,809)	(7,012)	(7,157)	(8,976)	(9,538)	(9,493)
Retail portfolio \| Consumer solar
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	303,538		325,154
Allowance for credit losses	(29,826)	$ (28,961)	(28,149)	$ (25,074)	$ (25,005)	$ (29,095)
Retail portfolio \| Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans receivable	$ 24,549		$ 27,686