SECURITIES - Summary of amortized cost of securities available for sale and their estimated fair value (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 323,801	$ 238,870
Gross Unrealized Gains	3,734	5,928
Gross Unrealized Losses	(2,643)	(211)
Estimated Fair Value	324,892	244,587
U.S. Treasury Notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	36,933	9,989
Gross Unrealized Gains	4	11
Gross Unrealized Losses	(105)	0
Estimated Fair Value	36,832	10,000
Corporate Bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	86,118	57,478
Gross Unrealized Gains	1,791	1,863
Gross Unrealized Losses	(290)	0
Estimated Fair Value	87,619	59,341
U.S. Government agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23,462	19,787
Gross Unrealized Gains	46	89
Gross Unrealized Losses	(179)	(201)
Estimated Fair Value	23,329	19,675
Obligations issued by U.S. states and their political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	19,172	23,280
Gross Unrealized Gains	1,152	1,515
Gross Unrealized Losses	0	0
Estimated Fair Value	20,324	24,795
Residential one-to-four family
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	116,166	71,773
Gross Unrealized Gains	140	951
Gross Unrealized Losses	(1,905)	(8)
Estimated Fair Value	114,401	72,716
Multifamily
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	35,412	56,563
Gross Unrealized Gains	598	1,499
Gross Unrealized Losses	(94)	(2)
Estimated Fair Value	35,916	$ 58,060
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,538
Gross Unrealized Gains	3
Gross Unrealized Losses	(70)
Estimated Fair Value	$ 6,471