Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities Schedule of Interest Rate Swaps Associated with TBA Contracts (Details)

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Derivative Instruments and Hedging Activities Schedule of Interest Rate Swaps Associated with TBA Contracts (Details) (Interest Rate Swaps Associated with TBA Contracts [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Derivative [Line Items]  
Derivative, Notional Amount $ 175,000
More than Four and within Five Years from Balance Sheet Date [Member]
 
Derivative [Line Items]  
Derivative, Notional Amount $ 175,000
Derivative, Average Fixed Interest Rate 0.4196%
Derivative, Average Variable Interest Rate 1.772%
Derivative, Average Remaining Maturity 4.5778