Organization (Details) (USD $)	1 Months Ended	9 Months Ended						0 Months Ended
	Apr. 30, 2011	Sep. 30, 2011	Sep. 30, 2012 item	Dec. 31, 2011	Sep. 30, 2012 Tysons Corner [Member] item	Sep. 30, 2012 Richmond [Member] item	Sep. 30, 2012 Suffolk [Member] item	Jul. 29, 2011 Paragon Transaction [Member]	Jul. 29, 2011 VBB Acquisition [Member]	Sep. 21, 2011 Series A Senior Noncumulative Perpetual Preferred Stock [Member]
Organization [Line Items]
Number of branches			6		1	2	3
Issuance of common stock, shares	4,600,000
Price per share, issuance and sale of common stock	$ 4.25
Proceeds from the issuance of common stock	$ 17,700,000	$ 17,683,000
Loans								58,291,000	70,893,000
Deposits assumed								76,550,000	77,525,000
Cash payment received								17,288,000	17,822,000
Liabilities premium percentage used to calculate consideration payment, percent								3.92%
Assets discount percentage used to calculate consideration payment, percent								3.77%
Assets acquired								58,654,000	92,877,000
Liabilities assumed								76,589,000	86,943,000
Discount on net assets									23,800,000
Business acquisition, net assets acquired								(17,935,000)	5,934,000
Preferred stock sold, shares			8,381	8,381						8,381
Preferred stock purchase price			$ 8,381,000	$ 8,381,000						$ 8,400,000