INVESTMENT SECURITIES - Amortized cost and fair value of securities available-for-sale (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 61,022	$ 55,266
Gross Unrealized Gains	149	478
Gross Unrealized Losses	(2,444)	(182)
Fair Value	58,727	55,562
U.S. Treasury debt
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	250	250
Gross Unrealized Losses	(11)	(3)
Fair Value	239	247
U.S. Government Agency
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,959	3,522
Gross Unrealized Losses	(92)
Fair Value	2,867	3,522
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	17,110	8,113
Gross Unrealized Gains	142	227
Gross Unrealized Losses	(169)	(15)
Fair Value	17,083	8,325
Government National Mortgage Association ("GNMA") mortgage-backed securities - residential
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	24,890	26,611
Gross Unrealized Gains	4	185
Gross Unrealized Losses	(1,352)	(146)
Fair Value	23,542	26,650
Federal National Mortgage Association ("FNMA") mortgage-backed securities - residential
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	13,779	14,400
Gross Unrealized Gains	3	43
Gross Unrealized Losses	(780)
Fair Value	13,002	14,443
Government CMO and MBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	672	878
Gross Unrealized Losses	(14)
Fair Value	658	878
Corporate CMO and MBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,362	1,492
Gross Unrealized Gains		23
Gross Unrealized Losses	(26)	(18)
Fair Value	1,336	1,497
Bank Technology Fund [Member]
Debt Securities, Available-for-sale [Line Items]
Payments To Partnership Fund	400
Investment balance included in other assets	400
Contractual Obligation	3,000
Potential Future Contribution Obligation	2,500
Small Business Investment Company ("SBIC")
Debt Securities, Available-for-sale [Line Items]
Contractual Obligation	1,000
Return of capital, received	100	100
Other Assets [Member] \| Small Business Investment Company ("SBIC")
Debt Securities, Available-for-sale [Line Items]
Investment balance included in other assets	$ 2,000	$ 2,000

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

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