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Valuation Schedule of Fair Value Measurements (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives-assets, at fair value	[1]	$ 23,049	$ 8,792
Financial derivatives–liabilities, at fair value	[1]	(333)	(1,863)
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Mortgage-backed securities, at fair value		1,575,983	1,685,998
Financial derivatives-assets, at fair value		23,049	8,792
Total mortgage-backed securities and financial derivatives–assets, at fair value		1,599,032	1,694,790
Financial derivatives–liabilities, at fair value		(333)	(1,863)
Total U.S. Treasury securities and financial derivatives-liabilities, at fair value		(26,700)	(83,152)
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		1,447	402
Financial derivatives–liabilities, at fair value		(320)	(735)
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		18,189	8,038
Financial derivatives–liabilities, at fair value		(13)	(1,128)
Fair Value, Measurements, Recurring [Member] | Swaption [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives-assets, at fair value			181
Fair Value, Measurements, Recurring [Member] | Futures [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives-assets, at fair value		3,413	171
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		145,769	176,774
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		7,866	9,230
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		1,297,612	1,369,589
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		19,051	29,558
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		75,049	70,617
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		18,684	12,205
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		11,952	18,025
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		(26,367)	(81,289)
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		3,413	171
Total mortgage-backed securities and financial derivatives–assets, at fair value		3,413	171
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 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] | Swaption [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives-assets, at fair value			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-assets, at fair value		3,413	171
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		1,564,242	1,674,912
Financial derivatives-assets, at fair value		19,636	8,621
Total mortgage-backed securities and financial derivatives–assets, at fair value		1,583,878	1,683,533
Financial derivatives–liabilities, at fair value		(333)	(1,863)
Total U.S. Treasury securities and financial derivatives-liabilities, at fair value		(26,700)	(83,152)
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		1,447	402
Financial derivatives–liabilities, at fair value		(320)	(735)
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		18,189	8,038
Financial derivatives–liabilities, at fair value		(13)	(1,128)
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Swaption [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives-assets, at fair value			181
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-assets, 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		145,769	176,774
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		7,866	9,230
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		1,297,612	1,369,589
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		19,051	29,558
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		75,049	70,617
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		14,576	9,951
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		4,319	9,193
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		(26,367)	(81,289)
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		11,741	11,086
Financial derivatives-assets, at fair value		0	0
Total mortgage-backed securities and financial derivatives–assets, at fair value		11,741	11,086
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] | Swaption [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial derivatives-assets, at fair value			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-assets, 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		4,108	2,254
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		7,633	8,832
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
[1] In the Company's Consolidated Balance Sheet, all balances associated with the repurchase agreements and financial derivatives are presented on a gross basis.

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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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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Fair value of obligations incurred from short sales.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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