Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2017	$ 83,817	$ 8,587	$ 12,075	$ 62,845	$ 310
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,539			2,539
Other comprehensive income (loss)					(2,593)
Vesting of restricted stock awards, stock incentive plan		23	(23)
Stock-based compensation expense	81		81
Issuance of common stock, dividend investment plan	180	14	166
Repurchase and retirement of common stock	(157)	(13)	(144)
Dividends declared	(796)			(796)
Balance at Mar. 31, 2018	83,071	8,611	12,155	64,588	(2,283)
Balance at Dec. 31, 2017	83,817	8,587	12,075	62,845	310
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,920
Other comprehensive income (loss)	(4,129)
Balance at Sep. 30, 2018	84,830	8,629	12,680	67,340	(3,819)
Balance at Mar. 31, 2018	83,071	8,611	12,155	64,588	(2,283)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,521			2,521
Other comprehensive income (loss)					(350)
Stock-based compensation expense	114		114
Issuance of common stock, dividend investment plan	104	8	96
Issuance of common stock, employee benefit plan	135	9	126
Dividends declared	(796)			(796)
Balance at Jun. 30, 2018	84,799	8,628	12,491	66,313	(2,633)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,860			1,860
Other comprehensive income (loss)	(1,186)				(1,186)
Stock-based compensation expense	177		177
Issuance of common stock, dividend investment plan	47	3	44
Issuance of common stock, employee benefit plan	23	2	21
Repurchase and retirement of common stock	(57)	(4)	(53)
Dividends declared	(833)			(833)
Balance at Sep. 30, 2018	84,830	8,629	12,680	67,340	(3,819)
Balance at Dec. 31, 2018	87,599	8,573	11,992	68,587	(1,553)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,571			2,571
Other comprehensive income (loss)					1,690
Vesting of restricted stock awards, stock incentive plan		25	(25)
Stock-based compensation expense	86		86
Issuance of common stock, dividend investment plan	116	9	107
Repurchase and retirement of common stock	(47)	(3)	(44)
Dividends declared	(830)			(830)
Balance at Mar. 31, 2019	91,185	8,604	12,116	70,328	137
Balance at Dec. 31, 2018	87,599	8,573	11,992	68,587	(1,553)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,928
Other comprehensive income (loss)	3,208
Balance at Sep. 30, 2019	94,630	8,532	11,472	72,971	1,655
Balance at Mar. 31, 2019	91,185	8,604	12,116	70,328	137
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,126			2,126
Other comprehensive income (loss)					1,304
Stock-based compensation expense	116		116
Issuance of common stock, dividend investment plan	179	15	164
Issuance of common stock, employee benefit plan	138	10	128
Repurchase and retirement of common stock	(1,451)	(110)	(1,341)
Dividends declared	(855)			(855)
Balance at Jun. 30, 2019	92,742	8,519	11,183	71,599	1,441
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,231			2,231
Other comprehensive income (loss)	214				214
Vesting of restricted stock awards, stock incentive plan		6	(6)
Stock-based compensation expense	217		217
Issuance of common stock, dividend investment plan	85	7	78
Dividends declared	(859)			(859)
Balance at Sep. 30, 2019	$ 94,630	$ 8,532	$ 11,472	$ 72,971	$ 1,655