Derivatives - Schedule of Changes in Fair Value of Derivative Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 137	$ 206	$ 147	$ 1,273
Derivative Instruments Designated As Hedging Instruments Interest Income	29	0	29	0
Derivative, Net Hedge Ineffectiveness Gain (Loss)	$ 0	$ 0	$ 0	$ 0