Other Real Estate Owned - Activity in Other Real Estate Owned (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Real Estate Properties [Line Items]
Beginning Balance	$ 7,241
Ending balance	9,388	$ 6,729
Other Real Estate Owned [Member]
Real Estate Properties [Line Items]
Beginning Balance	7,241	7,562
Additions	4,579	2,878
Sales	(2,153)	(2,909)
Gains (losses)/Write-downs	(279)	(802)
Ending balance	9,388	6,729
Other Real Estate Owned, Covered [Member]
Real Estate Properties [Line Items]
Beginning Balance	9,121	13,670
Additions	429	7,387
Sales	(4,580)	(8,113)
Gains (losses)/Write-downs	(217)	(1,789)
Ending balance	$ 4,753	$ 11,155