Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities Schedule of Inverse Interest-Only Securities Reconciliation (Details)

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Derivative Instruments and Hedging Activities Schedule of Inverse Interest-Only Securities Reconciliation (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Derivatives, Fair Value [Line Items]    
Inverse Interest-only Securities, Accrued Interest $ 2,653 $ 2,855
Not Designated as Hedging Instrument [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 1,412,374 1,525,845
Derivative, Unamortized Premium 0 0
Derivative, Designated Credit Reserve 0 0
Derivative, Net, Unamortized (1,198,616) (1,292,785)
Derivative, Amortized Cost Basis 213,758 233,060
Derivative, Gross Unrealized Gains 9,014 5,891
Derivative, Gross Unrealized Losses (12,441) (20,442)
Derivative, Carrying Value $ 210,331 $ 218,509