COMMITMENTS AND CONTINGENCIES (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Other Commitments
Other Commitments	$ 87.4	$ 86.0
Loans Sold or Securitized with Recourse
Guarantees
Principal amount of loans sold or securitized	561.2	589.9
Recourse reserve related to loan sales and securitizations totaled	6.0	4.4
Loans Sold or Securitized with Recourse | Single-family Loans with Full Recourse
Guarantees
Principal amount of loans sold or securitized	53.3	54.5
Loans Sold or Securitized with Recourse | Multi-family Loans with Limited Recourse
Guarantees
Principal amount of loans sold or securitized	507.9	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	1,160.0	1,230.0
Loans Securitized without Recourse
Guarantees
Principal amount of loans sold or securitized	$ 266.3	$ 273.7