Derivatives - Schedule of Changes in Fair Value of Derivative Assets and Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 593	$ 342	$ 363	$ 284
Derivative Instruments Designated As Hedging Instruments Interest Income	557	0	938	0
Derivative, Net Hedge Ineffectiveness Gain (Loss)	$ 12	$ 0	$ 21	$ 0