Litigation and Regulatory Contingencies (Details) (USD $)	0 Months Ended			0 Months Ended	12 Months Ended
	Oct. 04, 2012	Dec. 31, 2012	Dec. 31, 2012 Litigation And Regulatory Action [Member]	Dec. 04, 2012 Pending or Threatened Litigation [Member] Claims	Dec. 31, 2011 Pending or Threatened Litigation [Member]	Apr. 25, 2012 Pending or Threatened Litigation [Member]	Feb. 06, 2012 Pending or Threatened Litigation [Member] Claims	Nov. 01, 2011 Pending or Threatened Litigation [Member] loans
Reserve for litigation and regulatory contingency matters		$ 0	$ 2,400,000
Number of residential mortgage loans involved in breach of contract in appraisal services								194
Loss contingency, value of damages sought				108,000,000	129,000,000
Breach of contract claim						16,000,000
Number of breach of contract claims related to appraisal services				160			26
Payments for legal settlements	4,000,000
Costs associated with legal settlement	$ 3,800,000