Fair Values of Financial Instruments (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financial assets - Carrying Amount
Cash and Cash Equivalents	$ 13,290,000	$ 15,954,000	$ 12,605,000
Cash and due from banks	2,420,000	2,605,000
Interest-bearing deposits in other financial institutions	10,017,000	12,468,000
Federal funds sold	853,000	881,000
Investment securities available for sale	71,486,000	81,572,000
Investments in restricted stock	1,437,000	2,481,000
Ground rents	143,000	143,000
Loans, less allowance for credit losses	282,672,000	296,579,000
Accrued interest receivable	961,000	1,198,000
Cash value of life insurance	8,023,000	7,860,000
Financial liabilities - Carrying Amount
Deposits	321,440,000	322,453,000
Long-term borrowings	0	0
Short-term borrowings	25,000,000	55,000,000
Accrued interest payable	100,000	152,000
Unrecognized financial instruments:
Commitments to extend credit	26,297,000	19,905,000
Standby letters of credit	1,059,000	1,059,000
Financial assets - Fair Value
Cash and due from banks	2,420,000	2,605,000
Interest-bearing deposits in other financial institutions	10,017,000	12,468,000
Federal funds sold	853,000	881,000
Investment securities available for sale, at fair value	71,486,000	81,572,000
Investments in restricted stock	1,437,000	2,481,000
Ground rents	143,000	143,000
Loans, less allowance for credit losses	282,583,000	293,175,000
Accrued interest receivable	961,000	1,198,000
Cash value of life insurance	8,023,000	7,860,000
Financial liabilities - Fair Value
Deposits	300,944,000	307,271,000
Short-term borrowings	25,386,000	55,851,000
Accrued interest payable	100,000	152,000
Unrecognized financial instruments:
Commitments to extend credit	26,297,000	19,905,000
Standby letters of credit	$ 1,059,000	$ 1,059,000