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Valuation Schedule of Fair Value Measurements (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial derivatives-assets, at fair value $ 475 $ 11,839
Financial derivatives–liabilities, at fair value (19,886) (16,559)
Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 1,394,568 1,540,296
Financial derivatives-assets, at fair value 475 11,839
Total mortgage-backed securities and financial derivatives–assets, at fair value 1,395,043 1,552,135
Financial derivatives–liabilities, at fair value (19,886) (16,559)
Total U.S. Treasury securities and financial derivatives-liabilities, at fair value (57,721) (16,933)
Fair Value, Measurements, Recurring [Member] | TBA securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial derivatives-assets, at fair value 384 794
Financial derivatives–liabilities, at fair value (307) (2,536)
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial derivatives-assets, at fair value 91 11,045
Financial derivatives–liabilities, at fair value (19,458) (6,193)
Fair Value, Measurements, Recurring [Member] | Futures [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial derivatives–liabilities, at fair value (121) (7,830)
Fair Value, Measurements, Recurring [Member] | Agency RMBS [Member] | 15-year fixed rate mortgages [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 160,012 137,531
Fair Value, Measurements, Recurring [Member] | Agency RMBS [Member] | 20-year fixed rate mortgages [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 18,348 7,505
Fair Value, Measurements, Recurring [Member] | Agency RMBS [Member] | 30-year fixed rate mortgages [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 1,058,919 1,273,514
Fair Value, Measurements, Recurring [Member] | Agency RMBS [Member] | Adjustable Rate Mortgages    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 38,112 18,243
Fair Value, Measurements, Recurring [Member] | Agency RMBS [Member] | Reverse mortgages [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 98,436 75,904
Fair Value, Measurements, Recurring [Member] | Agency RMBS [Member] | Interest-Only [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 11,565 16,366
Fair Value, Measurements, Recurring [Member] | Non-Agency RMBS [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 9,176 11,233
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
U.S. Treasury securities sold short, at fair value (37,835) (374)
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 0 0
Financial derivatives-assets, at fair value 0 0
Total mortgage-backed securities and financial derivatives–assets, at fair value 0 0
Financial derivatives–liabilities, at fair value (121) (7,830)
Total U.S. Treasury securities and financial derivatives-liabilities, at fair value (121) (7,830)
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | TBA securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial derivatives-assets, at fair value 0 0
Financial derivatives–liabilities, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Interest Rate Swap [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial derivatives-assets, at fair value 0 0
Financial derivatives–liabilities, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Futures [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial derivatives–liabilities, at fair value (121) (7,830)
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Agency RMBS [Member] | 15-year fixed rate mortgages [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Agency RMBS [Member] | 20-year fixed rate mortgages [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Agency RMBS [Member] | 30-year fixed rate mortgages [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Agency RMBS [Member] | Adjustable Rate Mortgages    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Agency RMBS [Member] | Reverse mortgages [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Agency RMBS [Member] | Interest-Only [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Non-Agency RMBS [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | US Treasury Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
U.S. Treasury securities sold short, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 1,385,859 1,532,830
Financial derivatives-assets, at fair value 475 11,839
Total mortgage-backed securities and financial derivatives–assets, at fair value 1,386,334 1,544,669
Financial derivatives–liabilities, at fair value (19,765) (8,729)
Total U.S. Treasury securities and financial derivatives-liabilities, at fair value (57,600) (9,103)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | TBA securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial derivatives-assets, at fair value 384 794
Financial derivatives–liabilities, at fair value (307) (2,536)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Interest Rate Swap [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial derivatives-assets, at fair value 91 11,045
Financial derivatives–liabilities, at fair value (19,458) (6,193)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Futures [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial derivatives–liabilities, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Agency RMBS [Member] | 15-year fixed rate mortgages [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 160,012 137,531
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Agency RMBS [Member] | 20-year fixed rate mortgages [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 18,348 7,505
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Agency RMBS [Member] | 30-year fixed rate mortgages [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 1,058,919 1,273,514
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Agency RMBS [Member] | Adjustable Rate Mortgages    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 38,112 18,243
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Agency RMBS [Member] | Reverse mortgages [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 98,436 75,904
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Agency RMBS [Member] | Interest-Only [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 5,150 13,534
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Non-Agency RMBS [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 6,882 6,599
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | US Treasury Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
U.S. Treasury securities sold short, at fair value (37,835) (374)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 8,709 7,466
Financial derivatives-assets, at fair value 0 0
Total mortgage-backed securities and financial derivatives–assets, at fair value 8,709 7,466
Financial derivatives–liabilities, at fair value 0 0
Total U.S. Treasury securities and financial derivatives-liabilities, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | TBA securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial derivatives-assets, at fair value 0 0
Financial derivatives–liabilities, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Interest Rate Swap [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial derivatives-assets, at fair value 0 0
Financial derivatives–liabilities, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Futures [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial derivatives–liabilities, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Agency RMBS [Member] | 15-year fixed rate mortgages [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Agency RMBS [Member] | 20-year fixed rate mortgages [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Agency RMBS [Member] | 30-year fixed rate mortgages [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Agency RMBS [Member] | Adjustable Rate Mortgages    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Agency RMBS [Member] | Reverse mortgages [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Agency RMBS [Member] | Interest-Only [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 6,415 2,832
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Non-Agency RMBS [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities, at fair value 2,294 4,634
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | US Treasury Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
U.S. Treasury securities sold short, at fair value $ 0 $ 0