Commitments and Contingencies (Details) (Curtailment Guaranties, ClearPoint, USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012 item
Guarantees Relating to Certain Contractual Obligations of ClearPoint
Number of pools of loans	2
New loans
Guarantees Relating to Certain Contractual Obligations of ClearPoint
Loans aged less than 30 days on the warehouse lines	70.00%
Loans within 10 days of full curtailment	0.6
Minimum
Guarantees Relating to Certain Contractual Obligations of ClearPoint
Guaranteed payment percentage	5.00%
Maximum
Guarantees Relating to Certain Contractual Obligations of ClearPoint
Guaranteed payment percentage	100.00%