SECURITIES - Summary of amortized cost of securities available for sale and their estimated fair value (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 314,465	$ 350,431
Gross Unrealized Gains	56	53
Gross Unrealized Losses	(30,755)	(36,236)
Estimated Fair Value	283,766	314,248
U.S. Treasury Notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	36,935	46,937
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,875)	(3,178)
Estimated Fair Value	35,060	43,759
Corporate Bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	82,248	81,725
Gross Unrealized Gains	56	4
Gross Unrealized Losses	(5,681)	(5,431)
Estimated Fair Value	76,623	76,298
U.S. Government agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	11,519	12,248
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(379)	(782)
Estimated Fair Value	11,140	11,466
Obligations issued by U.S. states and their political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,423	16,559
Gross Unrealized Gains	0	49
Gross Unrealized Losses	(228)	(340)
Estimated Fair Value	6,195	16,268
Residential one-to-four family
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	149,808	164,843
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(21,266)	(24,657)
Estimated Fair Value	128,542	140,186
Multifamily
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,522	19,475
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(999)	(1,317)
Estimated Fair Value	11,523	18,158
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,010	8,644
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(327)	(531)
Estimated Fair Value	$ 14,683	$ 8,113