Litigation (Detail) - CommerceFirst Bank - USD ($)	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Loss Contingency Accrual		$ 6,500,000
Business Acquisition, Effective Date of Acquisition	Dec. 31, 2012
Loss Contingency Accrual, Increase (Decrease)	$ 400,000