Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Beginning balance at Dec. 31, 2014	$ 98,904	$ 8,742	$ 18,538	$ 72,168	$ (544)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	15,419			15,419
Other comprehensive loss	(461)				(461)
Stock options exercised	380	26	354
Issuance of restricted common stock	128	6	122
Dividend reinvestment plan shares issued from reserve	638	31	607
Cash dividend	(6,202)			(6,202)
Stock-based compensation expense recognized in earnings	332		332
Ending balance at Dec. 31, 2015	109,138	8,805	19,953	81,385	(1,005)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	16,404			16,404
Other comprehensive loss	(564)				(564)
Stock options exercised	532	36	496
Issuance of restricted common stock	128	5	123
Dividend reinvestment plan shares issued from reserve	907	35	872
Cash dividend	(6,350)			(6,350)
Stock-based compensation expense recognized in earnings	335		335
Ending balance at Dec. 31, 2016	120,530	8,881	21,779	91,439	(1,569)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	16,500			16,500
Other comprehensive loss	(207)				(207)
Stock options exercised	2,274	130	2,144
Issuance of common stock for business combination (9,516,097 shares)	285,673	7,946	277,727
Issuance of restricted common stock	129	4	125
Dividend reinvestment plan shares issued from reserve	5,638	185	5,453
Cash dividend	(9,355)			(9,355)
Stock-based compensation expense recognized in earnings	442		442
Ending balance at Dec. 31, 2017	$ 421,624	$ 17,146	$ 307,670	$ 98,584	$ (1,776)