SECURITIES - Summary of amortized cost of securities available for sale and their estimated fair value (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 390,313	$ 323,801
Gross Unrealized Gains	772	3,734
Gross Unrealized Losses	(15,471)	(2,643)
Estimated Fair Value	375,614	324,892
U.S. Treasury Note
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	46,939	36,933
Gross Unrealized Gains	0	4
Gross Unrealized Losses	(1,666)	(105)
Estimated Fair Value	45,273	36,832
Corporate Bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	86,560	86,118
Gross Unrealized Gains	415	1,791
Gross Unrealized Losses	(1,749)	(290)
Estimated Fair Value	85,226	87,619
U.S. Government agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	22,885	23,462
Gross Unrealized Gains	23	46
Gross Unrealized Losses	(544)	(179)
Estimated Fair Value	22,364	23,329
Obligations issued by U.S. states and their political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	19,115	19,172
Gross Unrealized Gains	293	1,152
Gross Unrealized Losses	(210)	0
Estimated Fair Value	19,198	20,324
Residential one-to-four family
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	178,941	116,166
Gross Unrealized Gains	5	140
Gross Unrealized Losses	(10,607)	(1,905)
Estimated Fair Value	168,339	114,401
Multifamily
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	29,604	35,412
Gross Unrealized Gains	36	598
Gross Unrealized Losses	(427)	(94)
Estimated Fair Value	29,213	35,916
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,269	6,538
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(268)	(70)
Estimated Fair Value	$ 6,001	$ 6,471