Derivatives - Schedule of Changes in Fair Value of Derivative Assets and Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (37)	$ (531)	$ (35)	$ (1,545)
Derivative Instruments Designated As Hedging Instruments Interest Income		424
Derivative, Net Hedge Ineffectiveness Gain (Loss)	(5)	26
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Instruments Designated As Hedging Instruments Interest Income	136		385	854
Derivative, Net Hedge Ineffectiveness Gain (Loss)			73	41
Forward Contracts [Member]
Derivative [Line Items]
Derivative, Net Hedge Ineffectiveness Gain (Loss)	(17)	0	95	0
Foreign Exchange [Member]
Derivative [Line Items]
Derivative, Net Hedge Ineffectiveness Gain (Loss)	$ (1)	$ 4	$ 1	$ 7