Fair Value Measurements (Carrying Amounts and Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financial assets:
Interest bearing deposits with banks	$ 703	$ 19,753
Interest bearing time deposits with banks	735	735
Restricted investment in bank stock	2,516	3,423
Financial liabilities:
Deposits: Non-interest bearing	181,735	168,115
Deposits: Interest bearing	525,847	454,751
Short-term borrowings	4,804	24,750
Federal Reserve Bank advances	0	27,955
Long-term debt	35,000	35,000
Other interest bearing liabilities	1,538	1,584
Carrying Value [Member]
Financial assets:
Cash and due from banks	11,995	11,868
Interest bearing deposits with banks	703	19,753
Interest bearing time deposits with banks	735	735
Securities	359,420	287,506
Restricted investment in bank stock	2,516	3,423
Loans, net of allowance for loan losses	408,039	418,567
Interest rate swaps, assets	435	0
Accrued interest receivable	2,052	2,105
Financial liabilities:
Deposits: Non-interest bearing	181,735	168,115
Deposits: Interest bearing	525,847	454,751
Securities sold under agreements to repurchase	4,804	4,750
Short-term borrowings	0	20,000
Federal Reserve Bank advances	0	27,955
Long-term debt	35,000	35,000
Interest rate swaps, liabilities	0	57
Other interest bearing liabilities	1,538	1,584
Accrued interest payable	313	448
Off-balance sheet financial instruments:
Commitments to extend credit	0	0
Letters of credit	0	0
Fair Value [Member]
Financial assets:
Cash and due from banks	11,995	11,868
Interest bearing deposits with banks	703	19,753
Interest bearing time deposits with banks	735	735
Securities	359,420	287,506
Loans, net of allowance for loan losses	409,460	424,791
Interest rate swaps, assets	435	0
Accrued interest receivable	2,052	2,105
Financial liabilities:
Deposits: Non-interest bearing	181,735	168,115
Deposits: Interest bearing	529,163	459,224
Short-term borrowings	0	20,002
Federal Reserve Bank advances	0	27,955
Long-term debt	36,747	37,365
Interest rate swaps, liabilities	0	57
Other interest bearing liabilities	1,538	1,585
Accrued interest payable	313	448
Off-balance sheet financial instruments:
Commitments to extend credit	0	0
Letters of credit	$ 0	$ 0