Changes in the Corporation's Liability of Estimated Losses Associated to Loans Sold by the Discontinued Operations of PFH (Detail) (Discontinued operations of PFH, Guarantee on loans sold or serviced with representation and warranties, USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Discontinued operations of PFH | Guarantee on loans sold or serviced with representation and warranties
Guarantor Obligations [Line Items]
Balance as of beginning of period	$ 4,261	$ 9,626	$ 8,058	$ 9,405
Additions for new sales
(Reversal) provision for representations and warranties		(1,796)		(1,118)
Net charge-offs / terminations	(50)	(1,080)	(50)	(1,537)
Other - settlements paid			(3,797)
Balance as of end of period	$ 4,211	$ 6,750	$ 4,211	$ 6,750