Consolidated Statements of Changes in Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Reclassification of net unrealized gains on equity securities from AOCI per ASU 2016-01 | ASU 2016-01 [Member]	$ 0	$ 0	$ 77	$ (77)	$ 0
Beginning Balance at Dec. 31, 2017	$ 25,087	17,270	54,738	(707)	96,388
Beginning Balance (in shares) at Dec. 31, 2017	5,017,458
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	3,531	0	3,531
Other comprehensive income (loss), net of tax	0	0	0	(2,769)	(2,769)
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
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
Employee Stock Purchase Plan share issuance	$ 14	52	0	0	66
Employee Stock Purchase Plan share issuance (in shares)	2,644
Stock-based compensation expense	$ 0	103	0	0	103
Cash dividends	0	0	(1,691)	0	(1,691)
Ending Balance at Sep. 30, 2018	$ 25,849	20,624	56,794	(3,692)	$ 99,575
Ending Balance (in shares) at Sep. 30, 2018	5,169,727				5,169,727
Beginning Balance at Jun. 30, 2018	$ 25,847	20,568	55,767	(2,889)	$ 99,293
Beginning Balance (in shares) at Jun. 30, 2018	5,169,023
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	1,597	0	1,597
Other comprehensive income (loss), net of tax	0	0	0	(803)	(803)
Issuance of common stock related to acquisition	$ (2)	(8)	0	0	(10)
Issuance of common stock related to acquisition (in shares)	0
Employee Stock Purchase Plan share issuance	$ 4	14	0	0	18
Employee Stock Purchase Plan share issuance (in shares)	704
Stock-based compensation expense	$ 0	50	0	0	50
Cash dividends	0	0	(570)	0	(570)
Ending Balance at Sep. 30, 2018	$ 25,849	20,624	56,794	(3,692)	$ 99,575
Ending Balance (in shares) at Sep. 30, 2018	5,169,727				5,169,727
Beginning Balance at Dec. 31, 2018	$ 25,853	20,698	57,611	(2,156)	$ 102,006
Beginning Balance (in shares) at Dec. 31, 2018	5,170,600				5,184,289
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	5,885	0	$ 5,885
Other comprehensive income (loss), net of tax	0	0	0	2,822	2,822
Employee Stock Purchase Plan share issuance	$ 14	46	0	0	60
Employee Stock Purchase Plan share issuance (in shares)	2,797
Restricted stock vested	$ 29	(29)	0	0	0
Restricted stock vested (in shares)	5,839
Stock-based compensation expense	$ 0	161	0	0	161
Cash dividends	0	0	(1,871)	0	(1,871)
Ending Balance at Sep. 30, 2019	$ 25,896	20,876	61,625	666	$ 109,063
Ending Balance (in shares) at Sep. 30, 2019	5,179,236				5,199,169
Beginning Balance at Jun. 30, 2019	$ 25,892	20,838	60,016	679	$ 107,425
Beginning Balance (in shares) at Jun. 30, 2019	5,178,339
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 0	0	2,232	0	2,232
Other comprehensive income (loss), net of tax	0	0	0	(13)	(13)
Employee Stock Purchase Plan share issuance	$ 4	16	0	0	20
Employee Stock Purchase Plan share issuance (in shares)	897
Stock-based compensation expense	$ 0	22	0	0	22
Cash dividends	0	0	(623)	0	(623)
Ending Balance at Sep. 30, 2019	$ 25,896	$ 20,876	$ 61,625	$ 666	$ 109,063
Ending Balance (in shares) at Sep. 30, 2019	5,179,236				5,199,169