Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Total
Beginning Balance at Dec. 31, 2016	$ 24,806	$ 16,427	$ 56,965	$ (4,208)	$ 93,990
Beginning Balance (in shares) at Dec. 31, 2016	4,961,258
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	(29)	0	(29)
Other comprehensive income (loss) net of tax	0	0	0	3,501	3,501
Issuance of common stock related to acquisition					0
Exercise of stock options	$ 290	875	0	0	1,165
Exercise of stock options (in shares)	58,105
Employee Stock Purchase Plan share issuance	$ 18	81	0	0	99
Employee Stock Purchase Plan share issuance (in shares)	3,548
Repurchase of common stock related to stock option exercises	$ (27)	(130)	0	0	(157)
Repurchase of common stock related to stock option exercises (in shares)	(5,453)
Stock-based compensation expense	$ 0	17	0	0	17
Cash dividends	0	0	(2,198)	0	(2,198)
Ending Balance at Dec. 31, 2017	$ 25,087	17,270	54,738	(707)	$ 96,388
Ending Balance (in shares) at Dec. 31, 2017	5,017,458				5,019,703
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassification of the stranded income tax effects of the Tax Cuts and Jobs Act from AOCI | ASU 2018-02 [Member]	$ 0	0	139	(139)	$ 0
Reclassification of net unrealized gains on equity securities | ASU 2016-01 [Member]	0	0	77	(77)	0
Net income	0	0	4,919	0	4,919
Other comprehensive income (loss) net of tax	0	0	0	(1,233)	(1,233)
Issuance of common stock related to acquisition	$ 748	3,199	0	0	3,947
Issuance of common stock related to acquisition (in shares)	149,625
Employee Stock Purchase Plan share issuance	$ 18	69	0	0	87
Employee Stock Purchase Plan share issuance (in shares)	3,517
Stock-based compensation expense	$ 0	160	0	0	160
Cash dividends	0	0	(2,262)	0	(2,262)
Ending Balance at Dec. 31, 2018	$ 25,853	$ 20,698	$ 57,611	$ (2,156)	$ 102,006
Ending Balance (in shares) at Dec. 31, 2018	5,170,600				5,184,289