Litigation (Detail) (CommerceFirst Bank, USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
CommerceFirst Bank
Loss Contingencies [Line Items]
Loss Contingency Accrual		$ 6,500,000
Business Acquisition, Effective Date of Acquisition	Dec. 31, 2012
Loss Contingency Accrual, Increase (Decrease)	$ 200,000