FAIR VALUE - Estimated fair values of the Company's financial instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financial assets - Carrying Amount
Cash and due from banks	$ 2,826	$ 2,117
Interest-bearing deposits in other financial institutions	26,466	29,730
Federal funds sold	2,172	5,246
Investment securities available for sale, at fair value	162,827	114,049
Investments in restricted stock	1,062	1,199
Ground rents	136	140
Loans, less allowance for credit losses	221,884	252,296
Accrued interest receivable	1,304	1,302
Cash value of life insurance	8,298	8,181
Financial liabilities - Carrying Amount
Deposits	374,509	349,620
Short-term borrowings	20,000	29,912
Accrued interest payable	14	16
Unrecognized financial instruments:
Commitments to extend credit	29,618	31,561
Standby letters of credit	971	1,044
Financial assets - Fair Value
Cash and due from banks	2,826	2,117
Interest-bearing deposits in other financial institutions	26,466	29,730
Federal funds sold	2,172	5,246
Investment securities available for sale, at fair value	162,827	114,049
Investments in restricted stock	1,062	1,199
Ground rents	136	140
Loans, less allowance for credit losses	229,081	253,946
Accrued interest receivable	1,304	1,302
Cash value of life insurance	8,298	8,181
Financial liabilities - Fair Value
Deposits	375,587	350,666
Short-term borrowings	20,006	29,935
Accrued interest payable	14	16
Unrecognized financial instruments:
Commitments to extend credit	29,618	31,561
Standby letters of credit	$ 971	$ 1,044