Quantitative Information About Recurring Level 3 Fair Value Measurements (Detail) - Fair Value Inut Level 3 - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Quantitative Information About Recurring Fair Value Measurements [Line Items]
Fair Value	$ 2,647	$ 2,801
Valuation Technique	Discounted cash flow	Discounted cash flow
Significant Unobservable Inputs	Probability of default	Probability of default
Range of Inputs, Minimum	0.88%	0.79%
Range of Inputs, Maximum	2.58%	2.49%