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Valuation Unobservable Input Reconciliation (Details) - Level 3 [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Agency RMBS [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 5,138 $ 12,542 $ 2,254 $ 12,347
Purchases 160 0 160 0
Proceeds from sales 0 0 0 0
Principal repayments 0 0 0 0
(Amortization)/accretion, net (415) (824) (692) (1,585)
Net realized gains (losses) (41) (37) (165) (73)
Change in net unrealized gains (losses) 253 (799) 499 (990)
Transfers        
Transfers into level 3 0 0 1,570 0
Transfers out of level 3 (1,469) (8,357) 0 (7,174)
Ending balance 3,626 2,525 3,626 2,525
Change in net unrealized gains (losses) for level 3 assets still held 200 (200) 700 (200)
Non-Agency RMBS [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance 5,355 2,502 8,832 6,498
Purchases 0 0 0 0
Proceeds from sales 0 (16) (3,638) (2,866)
Principal repayments (188) (215) (418) (424)
(Amortization)/accretion, net 126 84 171 136
Net realized gains (losses) 0 16 1,254 179
Change in net unrealized gains (losses) (34) 475 (942) 928
Transfers        
Transfers into level 3 1,734 5,567 1,734 1,999
Transfers out of level 3 0 (1,963) 0 0
Ending balance 6,993 6,450 6,993 6,450
Change in net unrealized gains (losses) for level 3 assets still held (65) 600 (15) 1,100
Residential Mortgage Backed Securities [Member]        
Transfers        
Transfers into level 3 1,700 5,600 $ 3,300 2,000
Transfers out of level 3 $ (1,500) $ (10,300)   $ (7,200)