SECURITIES - Summary of amortized cost of securities available-for-sale and their estimated fair value (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 336,866	$ 350,431
Gross Unrealized Gains	63	53
Gross Unrealized Losses	(36,006)	(36,236)
Estimated Fair Value	300,923	314,248
U.S. Treasury Note
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	46,936	46,937
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2,826)	(3,178)
Estimated Fair Value	44,110	43,759
Corporate Bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	81,609	81,725
Gross Unrealized Gains	37	4
Gross Unrealized Losses	(6,646)	(5,431)
Estimated Fair Value	75,000	76,298
U.S. Government agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,561	16,367
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(864)	(944)
Estimated Fair Value	14,697	15,423
Obligations issued by U.S. states and their political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	16,466	16,559
Gross Unrealized Gains	26	49
Gross Unrealized Losses	(358)	(340)
Estimated Fair Value	16,134	16,268
Residential one-to-four family
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	157,461	164,843
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(23,869)	(24,657)
Estimated Fair Value	133,592	140,186
Multifamily
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	14,309	19,475
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,138)	(1,317)
Estimated Fair Value	13,171	18,158
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,524	4,525
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(305)	(369)
Estimated Fair Value	$ 4,219	$ 4,156