CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)	Total
Balance at Dec. 31, 2013	$ 10,508	$ (8,495)	$ 224,793	$ 77,586	$ 1,134	$ 305,526
Balance (in shares) at Dec. 31, 2013	20,417,224
Increase (Decrease) in Shareholders' Equity
Net income				28,996		28,996
Other comprehensive income (loss)					12,579	12,579
Purchase of treasury stock		(319)				(319)
Purchase of treasury shares (in shares)	(19,078)
Stock option exercise	$ 4	113	(51)			66
Stock option exercise (in shares)	6,950
Stock option expense			160			160
Dividends — common stock				(8,726)		(8,726)
Restricted stock award	$ 23		464			487
Restricted stock award (in shares)	34,337
Director retainer award	$ 11		348			359
Director retainer award (in shares)	21,780
Issuance of common stock in acquisition	$ 613		20,921			21,534
Issuance of common stock in acquisition (in shares)	1,226,312
Balance at Dec. 31, 2014	$ 11,159	(8,701)	246,635	97,856	13,713	360,662
Balance (in shares) at Dec. 31, 2014	21,687,525
Increase (Decrease) in Shareholders' Equity
Net income				35,542		35,542
Other comprehensive income (loss)					(1,089)	(1,089)
Purchase of treasury stock		(3,527)				(3,527)
Purchase of treasury shares (in shares)	(176,405)
Stock option exercise	$ 13	416	(135)			294
Stock option exercise (in shares)	25,075
Stock option expense			180			180
Dividends — common stock				(11,680)		(11,680)
Restricted stock award	$ 21		642			663
Restricted stock award (in shares)	27,955
Director retainer award	$ 8		307			315
Director retainer award (in shares)	15,425
Balance at Dec. 31, 2015	$ 11,201	(11,812)	247,629	121,718	12,624	381,360
Balance (in shares) at Dec. 31, 2015	21,579,575
Increase (Decrease) in Shareholders' Equity
Net income				38,323		38,323
Other comprehensive income (loss)					(9,545)	(9,545)
Purchase of treasury stock		(1,045)				(1,045)
Purchase of treasury shares (in shares)	(39,888)
Stock option exercise	$ 55	1,948	(220)			1,783
Stock option exercise (in shares)	111,595
Stock option expense			91			91
Dividends — common stock				(14,296)		(14,296)
Restricted stock award	$ 22		1,032			1,054
Restricted stock award (in shares)	45,932
Director retainer award	$ 9		373			382
Director retainer award (in shares)	18,334
Issuance of common stock in acquisition	$ 1,176		50,211			51,387
Issuance of common stock in acquisition (in shares)	2,351,816
Balance at Dec. 31, 2016	$ 12,463	$ (10,909)	$ 299,116	$ 145,745	$ 3,079	$ 449,494
Balance (in shares) at Dec. 31, 2016	24,067,364