Reserve for Unfunded Commitments - Summary of Activity in Reserve for Unfunded Commitments (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
Commitments and Contingencies Disclosure [Abstract]
Balance at beginning of period	$ 2,045	$ 3,210	$ 2,415	$ 3,615
Reserve for unfunded commitments	175	(335)	(195)	(740)
Balance at end of period	$ 2,220	$ 2,875	$ 2,220	$ 2,875