Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest bearing deposits with banks	$ 10,998	$ 82
Federal funds sold	10,000
Interest bearing time deposits with banks	1,720	2,210
Restricted investment in bank stock	3,036	3,442
Deposits: Non-interest bearing	139,205	134,703
Deposits: Interest bearing	402,724	397,234
Long-term debt	45,000	45,000
Other interest bearing liabilities	1,574	1,603
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	16,826	12,658
Interest bearing deposits with banks	10,998	82
Federal funds sold	10,000
Interest bearing time deposits with banks	1,720	2,210
Securities	201,609	211,830
Restricted investment in bank stock	3,036	3,442
Loans, net of allowance for loan losses	386,681	397,629
Accrued interest receivable	1,537	1,607
Deposits: Non-interest bearing	139,205	134,703
Deposits: Interest bearing	402,724	397,234
Securities sold under agreements to repurchase	2,783	3,429
Short-term borrowings		9,700
Long-term debt	45,000	45,000
Other interest bearing liabilities	1,574	1,603
Accrued interest payable	466	473
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	16,826	12,658
Interest bearing deposits with banks	10,998	82
Federal funds sold	10,000
Interest bearing time deposits with banks	1,720	2,210
Securities	201,609	211,830
Loans, net of allowance for loan losses	388,228	403,359
Accrued interest receivable	1,537	1,607
Deposits: Non-interest bearing	139,205	134,703
Deposits: Interest bearing	406,156	399,848
Short-term borrowings		9,700
Long-term debt	47,355	45,809
Other interest bearing liabilities	1,576	1,603
Accrued interest payable	466	473
Commitments to extend credit
Letters of credit