Derivatives - Schedule of Changes in Fair Value of Derivative Assets and Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (13)	$ 470	$ (49)	$ (1,075)
Derivative Instruments Designated As Hedging Instruments Interest Income		404
Derivative, Net Hedge Ineffectiveness Gain (Loss)	9	16
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Instruments Designated As Hedging Instruments Interest Income	35		420	1,258
Derivative, Net Hedge Ineffectiveness Gain (Loss)			82	57
Forward Contracts [Member]
Derivative [Line Items]
Derivative, Net Hedge Ineffectiveness Gain (Loss)	61	0	(34)	0
Foreign Exchange [Member]
Derivative [Line Items]
Derivative, Net Hedge Ineffectiveness Gain (Loss)	$ 2	$ 7	$ 3	$ 14