Income Taxes - Deferred Tax Assets, Net (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Allowance for loan losses		$ 9,853,000	$ 12,880,000
Other than temporary impairment		827,000	807,000
Accrued liabilities		220,000	276,000
OREO property		3,767,000	1,268,000
Net operating loss		19,627,000	7,281,000
Sidus goodwill		921,000	1,050,000
Other		2,160,000	1,798,000
Deferred tax assets, gross		37,375,000	25,360,000
Less: Valuation Allowance		0	(11,000,000)
Deferred tax assets, net of valuation allowance		37,375,000	14,360,000
Deferred tax liabilities:
Unrealized gain on available-for-sale securities		(2,583,000)	(2,387,000)
FMV adjustment related to mergers		(181,000)	(255,000)
Depreciation		(1,561,000)	(1,980,000)
Prepaid expenses		(358,000)	(327,000)
Other		(142,000)	(195,000)
Deferred tax liabilities		(6,017,000)	(6,761,000)
Net deferred tax asset		31,358,000	7,599,000
Valuation allowance, deferred tax asset, change in amount	11,000,000
Core deposit intangible
Deferred tax liabilities:
Intangibles		(1,043,000)	(1,468,000)
Noncompete intangible
Deferred tax liabilities:
Intangibles		$ (149,000)	$ (149,000)