Quantitative Information About Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Foreclosed Assets Held For Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		$ 991
Valuation Technique		Market comparable properties
Unobservable Inputs		Selling costs
Foreclosed Assets Held For Sale | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range		35.00%
Foreclosed Assets Held For Sale | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range		10.00%
Collateral Dependent Impaired Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 519	$ 301
Valuation Technique	Market comparable properties	Market comparable properties
Unobservable Inputs	Marketability discount	Marketability discount