Reserve for Unfunded Commitments - Summary of Activity in Reserve for Unfunded Commitments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Balance at beginning of period	$ 2,475	$ 2,015	$ 2,475	$ 2,145
Provision (benefit) for losses - unfunded commitments	408	110	408	(20)
Balance at end of period	$ 2,883	$ 2,125	$ 2,883	$ 2,125