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Valuation Unobservable Input Reconciliation (Details) (Level 3 [Member], Non-Agency RMBS [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Level 3 [Member] | Non-Agency RMBS [Member]
 
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance 12/31/2012 $ 13,596
Transfers  
Transfers into level 3 0 [1]
Transfers out of level 3 0 [1]
Purchases 3,331
Proceeds from sales (5,309)
Principal repayments (440)
Amortization/accretion, net 139
Net realized gains 888
Change in net unrealized gains 155
Ending balance 3/31/2013 12,360
Change in net unrealized gain for level 3 assets still held as of March 31, 2013 $ 220
[1] Transfers are assumed to occur at the beginning of the period.