Fair Values of Financial Instruments - Activity for Real Estate Owned (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value Disclosures [Abstract]
Balance as of beginning of year	$ 739	$ 1,259
Foreclosures	3,641	1,481
Cost of sales	(2,799)	(1,660)
Impairment losses	(135)	(341)	(887)
Balance as of end of year	$ 1,446	$ 739	$ 1,259