Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands		Sep. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Certain impaired loans	[1]	$ 11,447	$ 3,930
Other assets	[2]	4,155	7,982
Total		15,602	11,912
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Certain impaired loans	[1]	11,447	3,930
Other assets	[2]	4,155	7,982
Total		$ 15,602	$ 11,912

[1] Represents the fair value of certain impaired loans, based on the value of the collateral.

[2] Represents the fair value of OREO, based on the appraised value of the collateral subsequent to its initial classification as OREO.