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Commitments and Contingencies (Details 2) (MBS Purchase Commitments, USD $) In Millions, unless otherwise specified	Mar. 31, 2012
Agency MBS
MBS Purchase Commitments
Estimated purchase price	$ 46.8
Non-Agency MBS
MBS Purchase Commitments
Estimated purchase price	$ 52.9

The floor amount as of the balance sheet date that the entity must expend to satisfy the terms of disclosed arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure goods or services from one or more suppliers, other than under a long-term purchase commitment or an unconditional purchase obligation.

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