Derivatives - Schedule of Changes in Fair Value of Derivative Assets and Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 470	$ (783)	$ (1,075)	$ (420)
Derivative Instruments Designated As Hedging Instruments Interest Income	404	(565)	1,258	1,503
Derivative, Net Hedge Ineffectiveness Gain (Loss)	$ 16	$ 0	$ 57	$ 21