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FAIR VALUE MEASUREMENTS - Financial instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Investment securities
Held-to-maturity	$ 13,152	$ 17,505
Securities available-for-sale, at fair value	88,339	20,730
Carrying Amount
Financial Assets:
Cash and cash equivalents	40,884	25,245
Investment securities
Held-to-maturity	13,498	17,523
Securities available-for-sale, at fair value	88,339	20,730
Loans receivable, net	129,566	148,778
Bank-owned life insurance	3,303	3,213
Financial Liabilities:
Deposits	176,795	164,598
Borrowed funds	9,018	8,838
Fair Value
Financial Assets:
Cash and cash equivalents	40,884	25,245
Investment securities
Held-to-maturity	13,152	17,505
Securities available-for-sale, at fair value	88,339	20,730
Loans receivable, net	128,591	148,674
Bank-owned life insurance	3,303	3,213
Financial Liabilities:
Deposits	176,869	164,951
Borrowed funds	8,720	9,052
Fair Value | Level 1
Financial Assets:
Cash and cash equivalents	40,884	25,245
Fair Value | Level 2
Investment securities
Held-to-maturity	13,152	17,505
Securities available-for-sale, at fair value	88,339	20,730
Bank-owned life insurance	3,303	3,213
Financial Liabilities:
Deposits	176,869	164,951
Borrowed funds	8,720	9,052
Fair Value | Level 3
Investment securities
Loans receivable, net	$ 128,591	$ 148,674

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