Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest bearing deposits with banks	$ 82	$ 110
Federal funds sold		729
Interest bearing time deposits with banks	2,210	3,290
Restricted investment in bank stock	3,442	2,441
Deposits: Non-interest bearing	134,703	126,057
Deposits: Interest bearing	397,234	395,665
Short-term borrowings	13,129	14,511
Long-term debt	45,000	15,000
Other interest bearing liabilities	1,603	1,596
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	12,658	15,617
Interest bearing deposits with banks	82	110
Federal funds sold		729
Interest bearing time deposits with banks	2,210	3,290
Securities	211,830	141,953
Restricted investment in bank stock	3,442	2,441
Loans, net of allowance for loan losses	397,629	414,597
Accrued interest receivable	1,607	1,681
Deposits: Non-interest bearing	134,703	126,057
Deposits: Interest bearing	397,234	395,665
Securities sold under agreements to repurchase	3,429	2,911
Short-term borrowings	9,700	11,600
Long-term debt	45,000	15,000
Other interest bearing liabilities	1,603	1,596
Accrued interest payable	473	289
Commitments to extend credit
Letters of credit
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	12,658	15,617
Interest bearing deposits with banks	82	110
Federal funds sold		729
Interest bearing time deposits with banks	2,210	3,290
Securities	211,830	141,953
Loans, net of allowance for loan losses	403,359	415,195
Accrued interest receivable	1,607	1,681
Deposits: Non-interest bearing	134,703	126,057
Deposits: Interest bearing	399,848	395,226
Short-term borrowings	9,700	11,600
Long-term debt	45,809	14,958
Other interest bearing liabilities	1,603	1,597
Accrued interest payable	473	289
Commitments to extend credit
Letters of credit