Consolidated Statement Of Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Gain/(Loss) [Member]	Treasury Stock [Member]	Total
Beginning balance, Shares at Dec. 31, 2013	19,732,926
Beginning balance at Dec. 31, 2013	$ 19,733	$ 99,937	$ 142,528	$ (3,011)		$ 259,187
Dividends declared:
Common			(3,131)			(3,131)
Net common stock issued under employee plans and related tax expense	$ 78	1,308				1,386
Net common stock issued under employee plans and related tax expense, shares	77,951
Other comprehensive income (loss), net of tax				2,616		2,616
Treasury shares purchased					$ (10,302)	(10,302)
Treasury shares purchased, shares	(617,818)
Net income			21,030			21,030
Ending balance, Shares at Dec. 31, 2014	19,193,059
Ending balance at Dec. 31, 2014	$ 19,811	101,245	160,427	(395)	(10,302)	270,786
Dividends declared:
Common			(4,624)			(4,624)
Stock issued for Bancshares acquisition	$ 1,214	20,152				21,366
Stock issued for Bancshares acquisition, shares	1,213,985
Net common stock issued under employee plans and related tax expense	$ 113	569				682
Net common stock issued under employee plans and related tax expense, shares	113,166
Other comprehensive income (loss), net of tax				(895)		(895)
Treasury shares purchased					(8,624)	(8,624)
Treasury shares purchased, shares	(513,408)
Net income			17,407			17,407
Ending balance, Shares at Dec. 31, 2015	20,006,802
Ending balance at Dec. 31, 2015	$ 21,138	121,966	173,210	(1,290)	(18,926)	296,098
Dividends declared:
Common			(6,074)			(6,074)
Net common stock issued under employee plans and related tax expense	$ 93	1,146				1,239
Net common stock issued under employee plans and related tax expense, shares	92,686
Other comprehensive income (loss), net of tax				383		383
Treasury shares purchased					(22,721)	(22,721)
Treasury shares purchased, shares	(1,424,761)
Net income			17,704			17,704
Ending balance, Shares at Dec. 31, 2016	18,674,727
Ending balance at Dec. 31, 2016	$ 21,231	$ 123,112	$ 184,840	$ (907)	$ (41,647)	$ 286,629