LOANS RECEIVABLE, NET - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total loans receivable	$ 4,423,780	$ 4,411,319
Total loans receivable, net	4,359,380	4,345,628
Related party loans outstanding	1,500	1,700
Commercial portfolio
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total loans receivable	2,566,415	2,536,176
Commercial portfolio | Commercial and industrial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total loans receivable	1,014,084	1,010,998
Commercial portfolio | Commercial and industrial | Loans Insured or Guaranteed by US Government Authorities
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total loans receivable	224,700	225,600
Nonperforming Financial Instruments
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total loans receivable, net	1,000	1,000
Asset Pledged as Collateral without Right | Federal Home Loan Bank Advances
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total loans receivable, net	$ 2,370,000	$ 2,350,000