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, 2013	$ 272,147	$ 0	$ 127	$ 878	$ 136,403	$ 545	$ 182,290	$ (48,096)
Balance (in shares) at Dec. 31, 2013			9,719,521
Net income	24,292						24,292
Other comprehensive loss (income)	3,569					3,569
Stock based compensation expenses	78				78
Shares issued under stock option plan	921				88		(45)	878
Shares issued under stock option plan (in shares)			52,258
Restricted share activity under stock incentive plans	(122)				(334)		0	212
Restricted share activity under stock incentive plans (in shares)			13,087
Shares issued from direct stock sales	76				31			45
Shares issued from direct stock sales (in shares)			2,804
Shares repurchased	(15,519)							(15,519)
Shares repurchased (in shares)			(553,136)
Common stock dividends declared	(5,937)						(5,937)
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	26,423						26,423
Other comprehensive loss (income)	(492)					(492)
Stock based compensation expenses	150				150
Warrant repurchase	(11,979)			(878)	(11,101)
Shares issued under stock option plan	1,469				230		(313)	1,552
Shares issued under stock option plan (in shares)			74,300
Restricted share activity under stock incentive plans	436				(58)		186	308
Restricted share activity under stock incentive plans (in shares)			18,006
Shares issued from direct stock sales	64				31			33
Shares issued from direct stock sales (in shares)			1,799
Excess tax benefit under stock option plan	216				216
Shares repurchased	(8,436)							(8,436)
Shares repurchased (in shares)			(225,808)
Common stock dividends declared	(7,159)						(7,159)
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	28,843						28,843
Other comprehensive loss (income)	(3,407)					(3,407)
Stock based compensation expenses	274				274
Shares issued under stock option plan	714				(21)		(26)	761
Shares issued under stock option plan (in shares)			36,358
Restricted share activity under stock incentive plans	517				370		(72)	219
Restricted share activity under stock incentive plans (in shares)			10,405
Shares issued from direct stock sales	63				33			30
Shares issued from direct stock sales (in shares)			1,480
Shares repurchased	(6,293)							(6,293)
Shares repurchased (in shares)			(167,868)
Common stock dividends declared	(7,890)						(7,890)
Balance at Dec. 31, 2016	$ 293,018	$ 0	$ 127	$ 0	$ 126,390	$ 215	$ 240,592	$ (74,306)
Balance (in shares) at Dec. 31, 2016			8,983,206