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Summary of the Activity in the Allowance for Losses on Residential Loans (Detail) (Residential Real Estate Loans Held for Investment, USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Residential Real Estate Loans Held for Investment
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	$ 62,922	$ 61,169	$ 62,432	$ 54,220
Charge-offs, net	(2,197)	(4,012)	(4,515)	(6,539)
Provision for loan losses	1,581	4,321	4,389	13,797
Balance at End of Period	$ 62,306	$ 61,478	$ 62,306	$ 61,478

Reflects the amount charged against earnings during the period as bad debt expense, net of recoveries of previously expensed credit losses.

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- Definition

Reflects the amount of loans and leases that have been removed, or charged off, from both loan receivables and the reserve for credit losses, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities.

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