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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Net Amount of Assets Presented in the Balance Sheet | $ 13,865 | $ 7,969
Net Amount of Liabilities Presented in the Balance Sheet | 99,670 | 0
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
MBS | 3,150,306 | 3,181,839
Mortgage loans held for investment, at fair value | 3,073 | 4,268
Total assets carried at fair value | 3,167,244 | 3,194,076
Total liabilities carried at fair value | 99,670 | 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 | 3,047 | 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 | 3,150,124 | 3,181,041
Mortgage loans held for investment, at fair value | 0 | 0
Total assets carried at fair value | 3,160,942 | 3,189,010
Total liabilities carried at fair value | 99,670 | 0
Fair Value, Measurements, Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
MBS | 182 | 798
Mortgage loans held for investment, at fair value | 3,073 | 4,268
Total assets carried at fair value | 3,255 | 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 | 3,047 | 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 | 3,047 | 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 | 10,818 | 4,767
Net Amount of Liabilities Presented in the Balance Sheet | 99,670 | 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 | 10,818 | 4,767
Net Amount of Liabilities Presented in the Balance Sheet | 99,670 | 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

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