Fair Value - Changes in Fair Value for Items Measured at Fair Value Pursuant to Election of the Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Schedule of Trading Securities and Other Trading Assets [Line Items]
Interest (Expense)	$ (5,898)	$ (8,622)	$ (19,441)	$ (27,903)
Residential Loans Held for Sale [Member]
Schedule of Trading Securities and Other Trading Assets [Line Items]
Other Gains and (Losses)	642	115	(41)	152
Interest Income		4		4
Interest (Expense)	(2)		(2)
Total Changes in Fair Values Included in Current Period Earnings	$ 640	$ 119	$ (43)	$ 156