Fair Value Disclosures - Other Real Estate Owned (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value Disclosures [Abstract]
Carrying value of other real estate owned prior to remeasurement	$ 881	$ 2,405
Write-downs included in gain (loss) on sale of other real estate owned	(135)	(445)
Fair value	$ 746	$ 1,960