Derivatives - Schedule of Changes in Fair Value of Derivative Assets and Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (783)	$ (108)	$ (420)	$ 175
Derivative Instruments Designated As Hedging Instruments Interest Income	565	29	1,503	29
Derivative, Net Hedge Ineffectiveness Gain (Loss)	$ 0	$ 0	$ 21	$ 0