Consolidated Statements 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 [Member]	Retained Earnings [Member]	Treasury Stock [Member]
Balance at Dec. 31, 2014	$ 279,505	$ 0	$ 127	$ 878	$ 136,266	$ 4,114	$ 200,600	$ (62,480)
Balance (in shares) at Dec. 31, 2014			9,234,534
Net income	19,860						19,860
Other comprehensive income	(205)					(205)
Stock option expense	103				103
Warrant repurchase	(11,979)			(878)	(11,101)
Shares issued under stock option plan	1,343				227		(313)	1,429
Shares issued under stock option plan, net (in shares)			67,960
Restricted share activity under stock incentive plans	334				(121)		185	270
Restricted share activity under stock incentive plans (in shares)			15,006
Shares issued from direct stock sales	52				25			27
Excess tax benefit under stock option plan	216				216
Shares issued direct purchases (in shares)			1,487
Shares repurchased	(5,348)							(5,348)
Shares repurchased (in shares)			(147,039)
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)
Balance (in shares) at Sep. 30, 2015			9,171,948
Balance at Dec. 31, 2015	280,197	0	$ 127	0	125,734	3,622	219,737	(69,023)
Balance (in shares) at Dec. 31, 2015			9,102,831
Net income	21,478						21,478
Other comprehensive income	1,345					1,345
Stock option expense	226				226
Shares issued under stock option plan	667				(18)		(26)	711
Shares issued under stock option plan, net (in shares)			33,808
Restricted share activity under stock incentive plans	389				236		(72)	225
Restricted share activity under stock incentive plans (in shares)			10,405
Shares issued from direct stock sales	43				22			21
Shares issued direct purchases (in shares)			1,068
Shares repurchased	(6,293)							(6,293)
Shares repurchased (in shares)			(167,746)
Common stock dividends declared	(5,914)						(5,914)
Balance at Sep. 30, 2016	$ 292,138	$ 0	$ 127	$ 0	$ 126,200	$ 4,967	$ 235,203	$ (74,359)
Balance (in shares) at Sep. 30, 2016			8,980,366