COMMITMENTS AND CONTINGENCIES (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Guarantees
Recourse reserve related to loan sales and securitizations totaled	$ 4.8	$ 4.4
Other Commitments
Other Commitments	84.6	86.0
Loans Sold or Securitized with Recourse
Guarantees
Principal amount of loans sold or securitized	461.8	589.9
Recourse reserve related to loan sales and securitizations totaled	4.8	4.4
Loans Sold or Securitized with Recourse | Single-family Loans with Full Recourse
Guarantees
Principal amount of loans sold or securitized	48.4	54.5
Loans Sold or Securitized with Recourse | Multi-family Loans with Limited Recourse
Guarantees
Principal amount of loans sold or securitized	413.4	535.4
Recourse provision limitation, maximum percentage of the top loss on the underlying loans	4.00%	4.00%
Loans Sold without Recourse
Guarantees
Principal amount of loans sold or securitized	953.2	1,230.0
Loans Securitized without Recourse
Guarantees
Principal amount of loans sold or securitized	$ 235.8	$ 273.7