Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Amount of Assets Presented in the Balance Sheet	$ 7,102	$ 7,969
Net Amount of Liabilities Presented in the Balance Sheet	22,595	0
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MBS	3,112,705	3,181,839
Mortgage loans held for investment, at fair value	2,617	4,268
Total assets carried at fair value	3,122,424	3,194,076
Total liabilities carried at fair value	22,595	0
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MBS	0	0
Mortgage loans held for investment, at fair value	0	0
Total assets carried at fair value	5,859	0
Total liabilities carried at fair value	0	0
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MBS	3,112,553	3,181,041
Mortgage loans held for investment, at fair value	0	0
Total assets carried at fair value	3,113,796	3,189,010
Total liabilities carried at fair value	22,595	0
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MBS	152	798
Mortgage loans held for investment, at fair value	2,617	4,268
Total assets carried at fair value	2,769	5,066
Total liabilities carried at fair value	0	0
Fair Value, Measurements, Recurring | Options on U.S. Treasury futures
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Amount of Assets Presented in the Balance Sheet	5,859	0
Fair Value, Measurements, Recurring | Options on U.S. Treasury futures | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Amount of Assets Presented in the Balance Sheet	5,859	0
Fair Value, Measurements, Recurring | Options on U.S. Treasury futures | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Amount of Assets Presented in the Balance Sheet	0	0
Fair Value, Measurements, Recurring | Options on U.S. Treasury futures | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Amount of Assets Presented in the Balance Sheet	0	0
Fair Value, Measurements, Recurring | Interest rate swaptions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Amount of Assets Presented in the Balance Sheet	0	3,202
Fair Value, Measurements, Recurring | Interest rate swaptions | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Amount of Assets Presented in the Balance Sheet	0	0
Fair Value, Measurements, Recurring | Interest rate swaptions | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Amount of Assets Presented in the Balance Sheet	0	3,202
Fair Value, Measurements, Recurring | Interest rate swaptions | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Amount of Assets Presented in the Balance Sheet	0	0
Fair Value, Measurements, Recurring | TBA securities | Long position
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Amount of Assets Presented in the Balance Sheet	1,243	4,767
Net Amount of Liabilities Presented in the Balance Sheet	22,595	0
Fair Value, Measurements, Recurring | TBA securities | Level 1 | Long position
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Amount of Assets Presented in the Balance Sheet	0	0
Net Amount of Liabilities Presented in the Balance Sheet	0	0
Fair Value, Measurements, Recurring | TBA securities | Level 2 | Long position
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Amount of Assets Presented in the Balance Sheet	1,243	4,767
Net Amount of Liabilities Presented in the Balance Sheet	22,595	0
Fair Value, Measurements, Recurring | TBA securities | Level 3 | Long position
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net Amount of Assets Presented in the Balance Sheet	0	0
Net Amount of Liabilities Presented in the Balance Sheet	$ 0	$ 0