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Condensed Financial Information - Parent Company Only (Schedule of Condensed Cash Flows Statement) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Operating Activities
Net income	$ 2,831	$ 2,231	$ 2,126	$ 2,571	$ 2,081	$ 1,860	$ 2,521	$ 2,539	$ 1,710	$ 2,007	$ 2,027	$ 2,042	$ 9,759	$ 9,001	$ 7,786
Provision for (recovery of) loan losses													629	777	(625)
Changes in assets and liabilities:
(Increase) decrease in other assets													894	2,404	1,465
Net cash provided by operating activities													11,348	(1,523)	9,367
Cash Flows from Investing Activities
Net (increase) decrease in loans													40,211	40,545	51,401
Net cash (used in) provided by investing activities													(57,982)	(53,659)	(64,287)
Cash Flows from Financing Activities
Cash dividends paid													(2,996)	(2,776)	(2,652)
Issuance of common stock, employee benefit plan													138	163	166
Retirement of common stock													1,771	1,261	1,564
Net cash used in financing activities													61,940	37,687	55,487
Increase (decrease) in cash													15,306	(17,495)	567
Cash and Cash Equivalents
Beginning				18,353				35,848				35,281	18,353	35,848	35,281
Ending	33,659				18,353				35,848				33,659	18,353	35,848
Parent Company [Member]
Cash Flows from Operating Activities
Net income													9,759	9,001	7,786
Provision for (recovery of) loan losses													0	2	(2)
Adjustments to reconcile net income to net cash provided by operating activities
Stock-based compensation expense													562	518	382
Undistributed earnings of subsidiary bank													(5,012)	(5,613)	(4,077)
Changes in assets and liabilities:
(Increase) decrease in other assets													50	(15)	62
Net cash provided by operating activities													5,259	3,923	4,027
Cash Flows from Investing Activities
Net (increase) decrease in loans													43	73	(58)
Net cash (used in) provided by investing activities													(43)	(73)	58
Cash Flows from Financing Activities
Cash dividends paid													(2,996)	(2,776)	(2,652)
Issuance of common stock, employee benefit plan													138	163	166
Retirement of common stock													1,771	1,261	1,564
Net cash used in financing activities													(4,629)	(3,874)	(4,050)
Increase (decrease) in cash													587	(24)	35
Cash and Cash Equivalents
Beginning				$ 402				$ 426				$ 391	402	426	391
Ending	$ 989				$ 402				$ 426				$ 989	$ 402	$ 426

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