Variable Interest Entities - Schedule of Payments Made to Entity Related to Guarantee Obligations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Variable Interest Entity [Line Items]
Recoveries from Charged-Off Loans	$ 0	$ 0	$ 0	$ (103)
2009 RSA [Member]
Variable Interest Entity [Line Items]
Regular Payments	1,589	77	2,747	383
Discharge Payments	0	0	0	0
Recoveries from Charged-Off Loans	0	0	0	(103)
Net guarantee obligation payments	$ 1,589	$ 77	$ 2,747	$ 280