Financial Derivatives (TBAs) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Financial derivatives–assets, at fair value-	$ 13,028	$ 15,479
Derivative Liability	14,171	24,553
Derivative Assets (Liabilities), at Fair Value, Net	(1,143)	(9,074)
TBA securities
Derivative [Line Items]
Notional Amount	567,848	354,077
Derivative, Cost Basis	(606,785)	(380,791)
Market Value Underlying	(605,086)	(380,754)
Derivative Assets (Liabilities), at Fair Value, Net	1,699	37
TBA securities | Long
Derivative [Line Items]
Notional Amount	217,773	149,990
Derivative, Cost Basis	219,886	155,008
Market Value Underlying	220,292	155,969
Derivative Assets (Liabilities), at Fair Value, Net	406	961
TBA securities | Short
Derivative [Line Items]
Notional Amount	785,621	504,067
Derivative, Cost Basis	(826,671)	(535,799)
Market Value Underlying	(825,378)	(536,723)
Derivative Assets (Liabilities), at Fair Value, Net	1,293	(924)
Financial Derivatives - Assets | TBA securities | Long
Derivative [Line Items]
Notional Amount	201,583	149,990
Derivative, Cost Basis	203,425	155,008
Market Value Underlying	203,835	155,969
Financial derivatives–assets, at fair value-	410	961
Financial Derivatives - Assets | TBA securities | Short
Derivative [Line Items]
Notional Amount	561,521	4,400
Derivative, Cost Basis	(594,634)	(4,765)
Market Value Underlying	(593,016)	(4,764)
Financial derivatives–assets, at fair value-	1,618	1
Financial Derivatives - Liabilities | TBA securities | Long
Derivative [Line Items]
Notional Amount	16,190	0
Derivative, Cost Basis	16,461	0
Market Value Underlying	16,457	0
Derivative Liability	(4)	0
Financial Derivatives - Liabilities | TBA securities | Short
Derivative [Line Items]
Notional Amount	224,100	499,667
Derivative, Cost Basis	(232,037)	(531,034)
Market Value Underlying	(232,362)	(531,959)
Derivative Liability	$ (325)	$ (925)