Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2013	$ 3,306	$ 23,562	$ 74,325	$ (1,225)	$ (7,912)	$ 92,056
Balance (in shares) at Dec. 31, 2013	3,305,517
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			13,385			13,385
Net other comprehensive income (loss)				1,992		1,992
Stock dividend	$ 29	1,568	(1,597)			0
Stock dividend (in shares)	29,719
Purchase of treasury stock					(814)	(814)
Restricted stock, executive and Board of Director awards		(189)			19	(170)
Restricted stock vesting		200				200
Cash dividend reinvestment paid from treasury stock		9	(480)		471	0
Cash dividends			(6,121)			(6,121)
Balance at Dec. 31, 2014	$ 3,335	25,150	79,512	767	(8,236)	100,528
Balance (in shares) at Dec. 31, 2014	3,335,236
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			11,626			11,626
Net other comprehensive income (loss)				(1,003)		(1,003)
Stock issued for acquisition	$ 337	15,647				15,984
Stock issued for acquisition (in shares)	336,515
Purchase of treasury stock					(2,455)	(2,455)
Restricted stock, executive and Board of Director awards		(256)			308	52
Restricted stock vesting		179				179
Forfeited restricted stock		7			(7)	0
Cash dividend reinvestment paid from treasury stock		(12)	(197)		209	0
Cash dividends			(5,151)			(5,151)
Balance at Dec. 31, 2015	$ 3,672	40,715	85,790	(236)	(10,181)	119,760
Balance (in shares) at Dec. 31, 2015	3,671,751
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			12,638			12,638
Net other comprehensive income (loss)				(1,156)		(1,156)
Stock dividend	$ 32	1,542	(1,574)			0
Stock dividend (in shares)	32,624
Purchase of treasury stock					(3,227)	(3,227)
Restricted stock, executive and Board of Director awards		(197)			288	91
Restricted stock vesting		184				184
Reissuance of treasury stock for employee stock purchase plan		(1)			60	59
Forfeited restricted stock		4			(4)	0
Cash dividend reinvestment paid from treasury stock		3	(495)		492	0
Cash dividends			(5,081)			(5,081)
Balance at Dec. 31, 2016	$ 3,704	$ 42,250	$ 91,278	$ (1,392)	$ (12,572)	$ 123,268
Balance (in shares) at Dec. 31, 2016	3,704,375