Consolidated Statements of Stockholders' Equity (Unaudited) (USD $) In Thousands, unless otherwise specified	Total	Preferred Stock [Member]	Common Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2010	$ 205,351	$ 400	$ 13,748	$ 151,545	$ 45,288	$ (5,630)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,524				3,524
Other comprehensive income	5,659					5,659
Dividends declared on preferred stock	(40)				(40)
Common stock issued under employee stock purchase plan	1			1
Proceeds from issuance of common stock in connection with dividend reinvestment and stock purchase plan	2,023		178	1,845
Common stock share-based awards	544			544
Ending balance at Jun. 30, 2011	217,062	400	13,926	153,935	48,772	29
Beginning balance at Dec. 31, 2011	220,020	400	14,125	156,184	45,497	3,814
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,446				5,446
Other comprehensive income	2,217					2,217
Dividends declared on preferred stock	(40)				(40)
Common stock issued under employee stock purchase plan	0
Proceeds from issuance of common stock in connection with dividend reinvestment and stock purchase plan	35		3	32
Common stock share-based awards	423			423
Ending balance at Jun. 30, 2012	$ 228,101	$ 400	$ 14,128	$ 156,639	$ 50,903	$ 6,031