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 (Loss) Income [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 (loss)	(2,194)				(2,194)
Other comprehensive income	12,082					12,082
Dividends declared on preferred stock	(60)				(60)
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	3,184		301	2,883
Common stock share-based awards	896			896
Ending balance at Sep. 30, 2011	219,260	400	14,049	155,325	43,034	6,452
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 (loss)	7,438				7,438
Other comprehensive income	3,622					3,622
Dividends declared on preferred stock	(60)				(60)
Common stock issued under employee stock purchase plan	0
Proceeds from issuance of common stock in connection with dividend reinvestment and stock purchase plan	50		3	47
Common stock share-based awards	752			752
Ending balance at Sep. 30, 2012	$ 231,822	$ 400	$ 14,128	$ 156,983	$ 52,875	$ 7,436