COMMITMENTS AND CONTINGENCIES (Details 2) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Other Commitments
Other Commitments	$ 87.3	$ 86.0
Loans Sold or Securitized with Recourse
Guarantees
Principal amount of loans sold or securitized	502.4	589.9
Recourse reserve related to loan sales and securitizations totaled	5.3	4.4
Loans Sold or Securitized with Recourse | Single-family Loans with Full Recourse
Guarantees
Principal amount of loans sold or securitized	50.1	54.5
Loans Sold or Securitized with Recourse | Multi-family Loans with Limited Recourse
Guarantees
Principal amount of loans sold or securitized	452.3	535.4
Recourse provision limitation, maximum percentage of the top loss on the underlying loans	4.00%
Loans Sold without Recourse
Guarantees
Principal amount of loans sold or securitized	988.0	1,230.0
Loans Securitized without Recourse
Guarantees
Principal amount of loans sold or securitized	$ 249.3	$ 273.7