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Valuation Unobservable Input Reconciliation (Details) - Level 3 [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Agency RMBS [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 7,639 $ 2,832
Purchases 77 0
Proceeds from sales 0 0
Principal repayments 0 0
(Amortization)/accretion, net (587) (250)
Net realized gains (losses) (1) (663)
Change in net unrealized gains (losses) (461) 535
Transfers    
Transfers into level 3 1,643 862
Transfers out of level 3 (1,344) 0
Ending balance 6,966 3,316
Change in net unrealized gains (losses) for level 3 assets still held (1,200) 400
Non-Agency RMBS [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance 3,273 4,634
Purchases 0 0
Proceeds from sales 0 0
Principal repayments (93) 453
(Amortization)/accretion, net 91 85
Net realized gains (losses) 0 0
Change in net unrealized gains (losses) (270) 344
Transfers    
Transfers into level 3 0 0
Transfers out of level 3 0 0
Ending balance 3,001 4,610
Change in net unrealized gains (losses) for level 3 assets still held (300) 300
Residential Mortgage Backed Securities [Member]    
Transfers    
Transfers into level 3 1,600 $ 900
Transfers out of level 3 $ (1,300)