Derivatives - Credit Value Adjustment Recorded Related to Notional Amount of Derivatives Outstanding (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Derivative, Fair Value, Net	$ (360)	$ (77)
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Notional Amount	307,909	274,718
Interest Rate Cap [Member]
Derivative [Line Items]
Derivative, Notional Amount	7,219	7,500
Credit Default Swap, Buying Protection [Member]
Derivative [Line Items]
Derivative, Notional Amount	103,196	82,197
Credit Default Swap, Selling Protection [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ (24,929)	$ (19,161)