Parent Company only Condensed Financial Information (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net income (loss)	$ 2,669	$ 2,486	$ 2,679	$ 2,075	$ 2,887	$ 4,817	$ 2,086	$ 1,581	$ 9,909	$ 11,371	$ (55,857)
Adjustments to reconcile net income (loss) to net cash provided by operating activities :
Amortization of restricted stock award, net of forfeitures and taxes									148	75	89
Net cash provided by operating activities									16,041	21,441	15,881
Cash flows from financing activities:
Repayment of subordinated debt									(14,423)
Payment of cash dividends - preferred stock									(373)	(4,672)
Repayment of preferred stock									(40,000)
Issuance of preferred stock, net of issuance costs											69,698
Net cash provided by (used in) financing activities									375,183	43,393	(63,224)
Net increase in cash and cash equivalents									300,693	695	26,615
Cash and cash equivalents, beginning of year				72,872				72,177	72,872	72,177	45,562
Cash and cash equivalents, end of year	373,565				72,872				373,565	72,872	72,177
Parent Company
Cash flows from operating activities:
Net income (loss)									9,909	11,371	(55,857)
Adjustments to reconcile net income (loss) to net cash provided by operating activities :
Amortization of restricted stock award, net of forfeitures and taxes									148	75	89
Equity in undistributed loss/(net income) of subsidiary bank									32,290	(14,348)	52,184
Net change in other assets and liabilities									(733)	(1,182)	1,396
Net cash provided by operating activities									41,614	(4,084)	(2,188)
Cash flows from investing activities:
Equity investment in subsidiary bank											(40,000)
Cash flows from financing activities:
Repayment of subordinated debt									(14,423)
Payment of cash dividends - preferred stock									(373)	(4,672)
Repayment of preferred stock									(40,000)
Issuance of common stock, net of issuance costs									28
Issuance of preferred stock, net of issuance costs											69,698
Net cash provided by (used in) financing activities									(54,768)	(4,672)	69,698
Net increase in cash and cash equivalents									(13,154)	(8,756)	27,510
Cash and cash equivalents, beginning of year				24,347				33,103	24,347	33,103	5,593
Cash and cash equivalents, end of year	$ 11,193				$ 24,347				$ 11,193	$ 24,347	$ 33,103