Commitments and Contingencies - Estimated Amounts of Regular, Discharge Payments Expect to Pay and Estimated Recoveries from Charged-off Loans (Parenthetical) (Detail) (2009 RSA [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 19, 2015
Summary Of Projections Of Estimated Payments And Recoveries [Line Items]
Discharge Payments	$ 0	$ 0	$ 0	$ 0
Subsequent Event [Member] | Fifth Amendment [Member]
Summary Of Projections Of Estimated Payments And Recoveries [Line Items]
Discharge Payments					$ 2,709