Reserve for Unfunded Commitments - Summary of Activity in Reserve for Unfunded Commitments (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments And Contingencies Disclosure [Abstract]
Balance at beginning of period	$ 3,615	$ 2,740	$ 2,640
Provision for losses - Unfunded commitments	(1,200)	875	100
Balance at end of period	$ 2,415	$ 3,615	$ 2,740