Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands, unless otherwise specified	Series A Preferred Stock [Member] Preferred Stock [Member]	Series A Preferred Stock [Member]	Series B Preferred Stock [Member] Preferred Stock [Member]	Series B Preferred Stock [Member] Retained Earnings [Member]	Series B Preferred Stock [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Balance at Dec. 31, 2009						$ 9,619	$ 97,908	$ 5,650	$ 17,068	$ (17,720)	$ (10,776)	$ 101,749
Net income									7,004			7,004
Other comprehensive income											3,101	3,101
Accretion of discount on preferred stock						81			(81)			0
Cash dividend on preferred stock									(500)			(500)
Proceeds from stock offerings							12,148	(770)				11,378
Warrant repurchased												0
Cash dividends declared on common stock									(1,852)			(1,852)
Issuance cost of common stock									(6)			(6)
Stock-based compensation expense								51				51
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock awarded								3		22		25
Option related tax trueup								7				7
Balance at Dec. 31, 2010						9,700	110,056	4,941	21,633	(17,698)	(7,675)	120,957
Net income									13,926			13,926
Other comprehensive income											2,229	2,229
Accretion of discount on preferred stock						300			(300)			0
Cash dividend on preferred stock									(520)			(520)
Proceeds from stock offerings			11,250		11,250
Warrant repurchased								(245)				(245)
Cash dividends declared on common stock									(1,955)			(1,955)
Issuance cost of common stock				(84)	(84)				(5)			(5)
Redemption of series A preferred stock	(10,000)	(10,000)
Exercise of stock options								(16)		344		328
Stock-based compensation expense								35				35
Balance at Dec. 31, 2011						11,250	110,056	4,715	32,695	(17,354)	(5,446)	135,916
Net income									17,507			17,507
Other comprehensive income											10,509	10,509
Cash dividend on preferred stock				(253)	(253)
Warrant repurchased												0
Cash dividends declared on common stock									(3,188)			(3,188)
Issuance cost of common stock									(8)			(8)
Exercise of stock options								19		122		141
Stock-based compensation expense								39				39
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Option related tax trueup								28				28
Balance at Dec. 31, 2012						$ 11,250	$ 110,056	$ 4,801	$ 46,753	$ (17,232)	$ 5,063	$ 160,691