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Commitments and Contingencies (Details 2) (MBS Purchase Commitments, USD $)	Dec. 31, 2011 Security
MBS Purchase Commitments
MBS Purchase Commitments
Number of MBS committed to be purchased	1
Estimated purchase price	$ 27,100,000
Linked repurchase agreements	$ 12,000,000

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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