Parent Company Only Condensed Financial Statements Parent Company Condensed Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating activities:
Net income (loss)	$ 4,665	$ (10,474)	$ 3,460
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:
Net cash provided by (used for) operating activities	7,205	14,745	8,878
Financing activities:
Dividends paid on common stock	(437)	(437)	(436)
Net cash flows provided by (used for) financing activities	(15,436)	31,304	37,624
Increase (decrease) in cash and cash equivalents	42,627	30,318	37,326
Cash and cash equivalents at beginning of year	92,072	61,754	24,428
Cash and cash equivalents at end of year	134,699	92,072	61,754
Parent Company
Operating activities:
Net income (loss)	4,665	(10,474)	3,460
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:
Equity in undistributed (earnings) loss of subsidiary	(5,092)	9,961	(4,278)
(Increase) decrease in other assets	(9)	(121)	646
Increase in other liabilities	237	158	212
Net cash provided by (used for) operating activities	(199)	(476)	40
Financing activities:
Dividends paid on common stock	(437)	(437)	(436)
Net cash flows provided by (used for) financing activities	(437)	(437)	(436)
Increase (decrease) in cash and cash equivalents	(636)	(913)	(396)
Cash and cash equivalents at beginning of year	2,444	3,357	3,753
Cash and cash equivalents at end of year	$ 1,808	$ 2,444	$ 3,357