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Business Combinations - summarizes the purchase price (Details) (USD $)	0 Months Ended	1 Months Ended
	Dec. 13, 2013	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Number of shares of BANKshares common stock outstanding			33,136,592us-gaap_CommonStockSharesOutstanding	23,637,434us-gaap_CommonStockSharesOutstanding
Per share exchange ratio	5	0.4975
Number of shares of common stock issued			33,143,202us-gaap_CommonStockSharesIssued	23,638,373us-gaap_CommonStockSharesIssued
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net		$ 76,800,000
BANKshares Member
Number of shares of BANKshares common stock outstanding		12,644,763
BANKshares preferred shares that convert to BANKshares common shares upon a change in control		1,476,660
Total BANKshares common shares including conversion of preferred shares		14,121,423
Per share exchange ratio		0.4975
Number of shares of common stock issued		7,025,408
Multiplied by common stock price per share on September 30, 2014		$ 10.93
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net		$ 76,787,709