Parent Company Financial Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Assets [Abstract]
Investment in wholly owned subsidiary	$ 1,430	$ 1,731
Other assets	28,117	32,662
Total Assets	831,483	781,150
Liabilities and stockholders' equity [Abstract]
Stockholders' equity	92,325	87,702	79,596	78,093
Total Liabilities and Stockholders' Equity	831,483	781,150
Statements of Operations [Abstract]
Income tax benefit	(1,723)	(1,132)	(7)
Net income	4,646	2,664	2,665
Net cash (used in) provided by operating activities [Abstract]
Net income	4,646	2,664	2,665
Adjustments to reconcile net income (loss) to net cash provided by operating activities [Abstract]
Net cash provided by operating activities	14,334	8,133	12,709
Cash flows from financing activities [Abstract]
Issuance of preferred stock	0	22,847	0
Dividend on preferred stock	(1,139)	(953)	(870)
Common stock issued and stock based compensation	93	105	144
Net cash provided by (used in) financing activities	43,804	39,405	(13,178)
Net increase (decrease) in cash and cash equivalents	21,187	465	(7,369)
Cash and cash equivalents at beginning of year	140,172	139,707	147,076
Cash and cash equivalents at end of year	161,359	140,172	139,707
Parent Company [Member]
Assets [Abstract]
Cash	4,638	5,688
Investment in wholly owned subsidiary	87,972	82,352
Other assets	0	2
Total Assets	92,610	88,042
Liabilities and stockholders' equity [Abstract]
Other liabilities	285	340
Stockholders' equity	92,325	87,702
Total Liabilities and Stockholders' Equity	92,610	88,042
Statements of Operations [Abstract]
Other operating expenses	(106)	(101)	(121)
Income tax benefit	44	41	50
Loss before undistributed earnings of subsidiary	(62)	(60)	(71)
Equity in undistributed earnings of subsidiary	4,708	2,724	2,736
Net income	4,646	2,664	2,665
Net cash (used in) provided by operating activities [Abstract]
Net income	4,646	2,664	2,665
Adjustments to reconcile net income (loss) to net cash provided by operating activities [Abstract]
Decrease in other assets	0	2	2
Increase in other liabilities	(54)	228	0
Equity in undistributed earnings of subsidiary	(4,708)	(2,724)	(2,736)
Net cash provided by operating activities	(116)	170	(69)
Cash flows from financing activities [Abstract]
Issuance of preferred stock	0	22,847	0
Redemption of preferred stock	0	(17,390)	0
Redemption of common stock warrants	0	(375)	0
Dividend on preferred stock	(1,139)	(953)	(870)
Common stock issued and stock based compensation	208	257	412
Cash in lieu of fractional shares	(3)	0	0
Net cash provided by (used in) financing activities	(934)	4,386	(458)
Net increase (decrease) in cash and cash equivalents	(1,050)	4,556	(527)
Cash and cash equivalents at beginning of year	5,688	1,132	1,659
Cash and cash equivalents at end of year	$ 4,638	$ 5,688	$ 1,132