Activities in Other Real Estate Owned (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Real Estate [Line Items]
Balance at beginning of period		$ 4,527
Additions	150	486
Sales and net direct write-downs		(5,249)
Net change in valuation allowance		2,000
Balance at end of period	$ 150	$ 1,764