Consolidated Statements of Changes in Stockholders’ Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance at Dec. 31, 2012	$ 7,273	$ 17,731	$ 174,650	$ 5,421	$ 205,075
Balance (in Shares) at Dec. 31, 2012	13,915
Net income			27,170		27,170
Other comprehensive income (loss), net of tax				(7,638)	(7,638)
Stock compensation expense		1,940			1,940
Stock issued for exercise of stock options, net of withholdings to satisfy employee tax obligations upon vesting of stock awards	$ 503	3,041	(169)		3,375
Stock issued for exercise of stock options, net of withholdings to satisfy employee tax obligations upon vesting of stock awards (in Shares)	151
Stock issued for non-vested restricted stock	$ 184	1,083	(1,267)
Stock issued for non-vested restricted stock (in Shares)	55
Stock issued for acquisition	$ 1,769	10,429			12,198
Stock issued for acquisition (in Shares)	531
Cash dividends declared			(11,670)		(11,670)
Shares repurchased or cancelled	$ (148)	(969)	111		(1,006)
Shares repurchased or cancelled (in Shares)	(43)
Balance at Dec. 31, 2013	$ 9,581	33,255	188,825	(2,217)	229,444
Balance (in Shares) at Dec. 31, 2013	14,609
Net income			34,822		34,822
Other comprehensive income (loss), net of tax				4,302	4,302
Stock compensation expense		2,016			2,016
Stock issued for exercise of stock options, net of withholdings to satisfy employee tax obligations upon vesting of stock awards	$ 380	2,585	(114)		2,851
Stock issued for exercise of stock options, net of withholdings to satisfy employee tax obligations upon vesting of stock awards (in Shares)	114
Stock issued for non-vested restricted stock	$ 133	1,022	(1,155)
Stock issued for non-vested restricted stock (in Shares)	40
Stock issued for share-based awards, net of withholdings to satisfy employee employee tax obligations	$ 18	(112)			(94)
Stock issued for share-based awards, net of withholdings to satisfy employee employee tax obligations (in Shares)	5
Cash dividends declared			(12,924)		(12,924)
Shares repurchased or cancelled	$ (77)	(575)	130		(522)
Shares repurchased or cancelled (in Shares)	(23)
Balance at Dec. 31, 2014	$ 10,035	38,191	209,584	2,085	259,895
Balance (in Shares) at Dec. 31, 2014	14,745
Net income			37,187		37,187
Other comprehensive income (loss), net of tax				(1,453)	(1,453)
Stock compensation expense		2,134			2,134
Stock issued for exercise of stock options, net of withholdings to satisfy employee tax obligations upon vesting of stock awards	$ 477	3,652	(220)		3,909
Stock issued for exercise of stock options, net of withholdings to satisfy employee tax obligations upon vesting of stock awards (in Shares)	143
Stock issued for non-vested restricted stock	$ 117	1,099	(1,216)
Stock issued for non-vested restricted stock (in Shares)	35
Stock issued for share-based awards, net of withholdings to satisfy employee employee tax obligations	$ 61	(256)	(128)		(323)
Stock issued for share-based awards, net of withholdings to satisfy employee employee tax obligations (in Shares)	18
Cash dividends declared			(14,248)		(14,248)
Shares repurchased or cancelled	$ (74)	(640)	132		(582)
Shares repurchased or cancelled (in Shares)	(22)
Balance at Dec. 31, 2015	$ 10,616	$ 44,180	$ 231,091	$ 632	$ 286,519
Balance (in Shares) at Dec. 31, 2015	14,919