Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financial assets - Carrying Amount
Cash and due from banks	$ 2,610	$ 3,195
Interest-bearing deposits in other financial institutions	9,846	4,230
Federal funds sold	149	3,197
Investment securities	89,349	94,606
Investments in restricted stock	1,232	1,230
Ground rents	153	164
Loans, less allowance for credit losses	269,023	262,574
Accrued interest receivable	1,133	1,135
Cash value of life insurance	8,713	9,328
Financial liabilities - Carrying Amount
Deposits	334,238	333,246
Long-term borrowings		10,000
Short-term borrowings	20,000	10,000
Accrued interest payable	101	34
Unrecognized financial instruments:
Commitments to extend credit	19,109	25,165
Standby letters of credit	71	48
Financial assets - Fair Value
Cash and due from banks	2,610	3,195
Interest-bearing deposits in other financial institutions	9,846	4,230
Federal funds sold	149	3,197
Investment securities	89,349	94,606
Investments in restricted stock	1,232	1,230
Ground rents	153	164
Loans, less allowance for credit losses	275,819	260,223
Accrued interest receivable	1,133	1,135
Cash value of life insurance	8,713	9,328
Financial liabilities - Fair Value
Deposits	324,512	315,418
Long-term borrowings		10,257
Short-term borrowings	20,739	10,188
Accrued interest payable	101	34
Unrecognized financial instruments:
Commitments to extend credit	19,109	25,165
Standby letters of credit	$ 71	$ 48