Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Common Stock Warrant [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2013	$ 272,147	$ 0	$ 127	$ 878	$ 136,403	$ 545	$ 182,290	$ (48,096)
Net income	17,937						17,937
Other comprehensive income (loss)	2,756					2,756
Stock option expense	60				60
Shares issued under stock option plan	538				15		(46)	569
Restricted share activity under stock incentive plans	(101)				(313)			212
Shares issued from direct purchases	73				29			44
shares repurchased	(10,873)							(10,873)
Common stock dividends declared	(4,304)						(4,304)
Balance at Sep. 30, 2014	278,233	0	127	878	136,194	3,301	195,877	(58,144)
Balance at Dec. 31, 2014	279,505	0	127	878	136,266	4,114	200,600	(62,480)
Net income	19,860						19,860
Other comprehensive income (loss)	(205)					(205)
Stock option expense	103				103
Warrant repurchase	(11,979)			(878)	(11,101)
Shares issued under stock option plan	1,559				443		(313)	1,429
Restricted share activity under stock incentive plans	334				(121)		185	270
Shares issued from direct purchases	52				25			27
shares repurchased	(5,348)							(5,348)
Common stock dividends declared	(5,325)						(5,325)
Balance at Sep. 30, 2015	$ 278,556	$ 0	$ 127	$ 0	$ 125,615	$ 3,909	$ 215,007	$ (66,102)