FAIR VALUE - Estimated fair values of the Company's financial instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financial assets - Carrying Amount
Cash and due from banks	$ 2,449	$ 2,610
Interest-bearing deposits	5,896	9,846
Federal funds sold	183	149
Debt securities	90,329	89,349
Investments in restricted stock	1,231	1,232
Ground rents	150	153
Loans, net	272,817	269,023
Accrued interest receivable	1,182	1,133
Cash value of life insurance	8,290	8,713
Financial liabilities - Carrying Amount
Deposits	336,170	334,238
Short-term borrowings	20,000	20,000
Accrued interest payable	112	101
Unrecognized financial instruments:
Commitments to extend credit	22,210	19,109
Standby letters of credit	84	71
Financial assets - Fair Value
Cash and due from banks	2,449	2,610
Interest-bearing deposits	5,896	9,846
Federal funds sold	183	149
Investment securities	90,329	89,349
Investments in restricted stock	1,231	1,232
Ground rents	150	153
Loans, less allowance for credit losses	271,053	275,819
Accrued interest receivable	1,182	1,133
Cash value of life insurance	8,290	8,713
Financial liabilities - Fair Value
Deposits	315,964	324,512
Short-term borrowings	20,781	20,739
Accrued interest payable	112	101
Unrecognized financial instruments:
Commitments to extend credit	22,210	19,109
Standby letters of credit	$ 84	$ 71