Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2011	$ 135,916	$ 11,250	$ 110,056	$ 4,715	$ 32,695	$ (17,354)	$ (5,446)
Net income	13,038				13,038
Other comprehensive loss, net of tax	10,619						10,619
Dividend on series B preferred stock	(253)				(253)
Issuance cost of common stock	(6)				(6)
Cash dividends declared on common stock	(2,288)				(2,288)
Stock issued for options exercise	132			12		120
Stock-based compensation expense	27			27
Balance at Sep. 30, 2012	157,185	11,250	110,056	4,754	43,186	(17,234)	5,173
Balance at Dec. 31, 2012	160,691	11,250	110,056	4,801	46,753	(17,232)	5,063
Net income	14,941				14,941
Other comprehensive loss, net of tax	(7,296)						(7,296)
Dividend on series B preferred stock	(141)				(141)
Issuance cost of common stock	(9)				(9)
Cash dividends declared on common stock	(3,352)				(3,352)
Dividend on restricted stocks declared	(1)				(1)
Issuance of restricted stock awards (18,829 shares)	243			91		152
Stock issued for options exercise	21			19		2
Stock-based compensation expense	41			41
Balance at Sep. 30, 2013	$ 165,138	$ 11,250	$ 110,056	$ 4,952	$ 58,191	$ (17,078)	$ (2,233)