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Valuation Schedule of Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives-assets, at fair value	$ 1,732	$ 4,180
Financial derivatives–liabilities, at fair value	(20,234)	(2,047)
Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives-assets, at fair value	1,732	4,180
Total mortgage-backed securities, other investments, and financial derivatives–assets, at fair value	1,052,608	1,405,958
Financial derivatives–liabilities, at fair value	(20,234)	(2,047)
Total U.S. Treasury securities and financial derivatives-liabilities, at fair value	(22,388)	(4,117)
Fair Value, Recurring [Member] | TBA securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives-assets, at fair value	782	122
Financial derivatives–liabilities, at fair value	(3,582)	(304)
Fair Value, 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	619	3,624
Financial derivatives–liabilities, at fair value	(12,952)	(1,647)
Fair Value, Recurring [Member] | Futures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives-assets, at fair value	331	434
Financial derivatives–liabilities, at fair value	(3,700)	(96)
Fair Value, 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	132,375	181,231
Fair Value, 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	1,187	1,385
Fair Value, 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	765,220	1,058,878
Fair Value, 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	30,233	33,255
Fair Value, 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	98,357	99,934
Fair Value, 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	15,629	18,244
Fair Value, Recurring [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	1,050,521	1,401,778
Fair Value, Recurring [Member] | Other Investments [Member] | Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	355
Fair Value, 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	7,520	8,851
Fair Value, 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	(2,154)	(2,070)
Fair Value, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives-assets, at fair value	331	434
Total mortgage-backed securities, other investments, and financial derivatives–assets, at fair value	686	434
Financial derivatives–liabilities, at fair value	(3,700)	(96)
Total U.S. Treasury securities and financial derivatives-liabilities, at fair value	(3,700)	(96)
Fair Value, 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, 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, Recurring [Member] | Level 1 [Member] | Futures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives-assets, at fair value	331	434
Financial derivatives–liabilities, at fair value	(3,700)	(96)
Fair Value, 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, 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, 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, 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, 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, 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, Recurring [Member] | Level 1 [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	0	0
Fair Value, Recurring [Member] | Level 1 [Member] | Other Investments [Member] | Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	355
Fair Value, 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, 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, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives-assets, at fair value	1,401	3,746
Total mortgage-backed securities, other investments, and financial derivatives–assets, at fair value	1,041,955	1,394,612
Financial derivatives–liabilities, at fair value	(16,534)	(1,951)
Total U.S. Treasury securities and financial derivatives-liabilities, at fair value	(18,688)	(4,021)
Fair Value, 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	782	122
Financial derivatives–liabilities, at fair value	(3,582)	(304)
Fair Value, 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	619	3,624
Financial derivatives–liabilities, at fair value	(12,952)	(1,647)
Fair Value, Recurring [Member] | Level 2 [Member] | Futures [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, 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	132,375	181,231
Fair Value, 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	1,187	1,385
Fair Value, 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	765,220	1,058,878
Fair Value, 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	30,233	33,255
Fair Value, 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	98,357	99,934
Fair Value, 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	8,663	10,605
Fair Value, Recurring [Member] | Level 2 [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	1,040,554	1,390,866
Fair Value, Recurring [Member] | Level 2 [Member] | Other Investments [Member] | Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	0
Fair Value, 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	4,519	5,578
Fair Value, 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	(2,154)	(2,070)
Fair Value, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives-assets, at fair value	0	0
Total mortgage-backed securities, other investments, and financial derivatives–assets, at fair value	9,967	10,912
Financial derivatives–liabilities, at fair value	0	0
Total U.S. Treasury securities and financial derivatives-liabilities, at fair value	0	0
Fair Value, 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, 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, Recurring [Member] | Level 3 [Member] | Futures [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, 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, 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, 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, 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, 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, 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	6,966	7,639
Fair Value, Recurring [Member] | Level 3 [Member] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	9,967	10,912
Fair Value, Recurring [Member] | Level 3 [Member] | Other Investments [Member] | Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value	0
Fair Value, 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	3,001	3,273
Fair Value, 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

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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