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Valuation Unobservable Input Reconciliation (Details) - Level 3 [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Agency RMBS [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 2,254 $ 12,347
Purchases 1,529 1,287
Proceeds from sales 0 0
Principal repayments 0 0
(Amortization)/accretion, net (442) (835)
Net realized gains (losses) (125) (37)
Change in net unrealized gains (losses) 358 (220)
Transfers    
Transfers into level 3 1,564 0
Transfers out of level 3 0 0
Ending balance 5,138 12,542
Change in net unrealized gains (losses) for level 3 assets still held 500 (200)
Non-Agency RMBS [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 8,832 6,498
Purchases 0 0
Proceeds from sales (3,638) (2,850)
Principal repayments (230) (167)
(Amortization)/accretion, net 46 44
Net realized gains (losses) 1,138 163
Change in net unrealized gains (losses) (793) 332
Transfers    
Transfers into level 3 0 1,819
Transfers out of level 3 0 (3,337)
Ending balance 5,355 2,502
Change in net unrealized gains (losses) for level 3 assets still held 200 200
Residential Mortgage Backed Securities [Member]    
Transfers    
Transfers into level 3 $ 1,600 1,800
Transfers out of level 3   $ (3,300)