Litigation and Regulatory Contingencies (Details) (USD $)				0 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013 Litigation And Regulatory Action [Member]	Dec. 31, 2012 Litigation And Regulatory Action [Member]	Dec. 04, 2012 Pending Litigation [Member] loans	Jun. 20, 2013 Pending Litigation [Member] loans	Jun. 30, 2012 Pending Litigation [Member]	Apr. 25, 2012 Pending Litigation [Member]	Feb. 06, 2012 Pending Litigation [Member] Claims	Nov. 01, 2011 Pending Litigation [Member] loans
Loss Contingency Accrual, at Carrying Value	$ 0	$ 1,700,000	$ 2,400,000
Number of Residential Mortgage Loans Involved in Breach of Contract in Appraisal Services				160	146				194
Loss Contingency, Damages Sought, Value				108,000,000	98,900,000	129,000,000
Number of Mortgage claims dismissed					14
Breach Of Contract Claim							$ 16,000,000
Number Of Breach Of Contract Claims Related To Appraisal Services								26