Litigation and Regulatory Contingencies (Details) (Pending or Threatened Litigation [Member], USD $)	0 Months Ended	6 Months Ended	12 Months Ended
	Dec. 04, 2012 loans	Jun. 20, 2013 loans	Dec. 31, 2011	Apr. 25, 2012	Feb. 06, 2012 Claims	Nov. 01, 2011 loans
Pending or Threatened Litigation [Member]
Number of residential mortgage loans involved in breach of contract in appraisal services	160	146				194
Loss contingency, value of damages sought	$ 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