Other Real Estate Owned - Carrying Amount for Other Real Estate Owned (Detail) (USD $) In Thousands, unless otherwise specified				6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Jun. 30, 2014 Other Real Estate Owned [Member]	Jun. 30, 2013 Other Real Estate Owned [Member]	Jun. 30, 2014 Other Real Estate Owned, Covered [Member]	Jun. 30, 2013 Other Real Estate Owned, Covered [Member]
Real Estate Properties [Line Items]
Beginning balance	$ 6,729	$ 7,562	$ 7,739	$ 7,562	$ 11,179	$ 13,670	$ 26,137
Additions				2,878	2,682	7,387	5,354
Sales				(2,909)	(5,001)	(8,113)	(5,823)
Write-downs/other adjustments				(802)	(1,121)	(1,789)	(2,537)
Ending balance	$ 6,729	$ 7,562	$ 7,739	$ 6,729	$ 7,739	$ 11,155	$ 23,131