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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | $ 4,290 | $ 6,563
Derivative liabilities | 974 | 1,218
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgage-backed securities | 5,188,163 | 3,749,464
Assets, Fair Value Disclosure | 5,192,453 | 3,756,027
Financial Liabilities Fair Value Disclosure | 974 | 1,218
Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgage-backed securities | 0 | 0
Assets, Fair Value Disclosure | 2,883 | 0
Financial Liabilities Fair Value Disclosure | 0 | 1,218
Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgage-backed securities | 5,186,473 | 3,747,190
Assets, Fair Value Disclosure | 5,187,880 | 3,753,753
Financial Liabilities Fair Value Disclosure | 974 | 0
Fair Value, Measurements, Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgage-backed securities | 1,690 | 2,274
Assets, Fair Value Disclosure | 1,690 | 2,274
Financial Liabilities Fair Value Disclosure | 0 | 0
Fair Value, Measurements, Recurring | Interest rate swaps |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0 | 324
Fair Value, Measurements, Recurring | Interest rate swaps | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0 | 0
Fair Value, Measurements, Recurring | Interest rate swaps | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0 | 324
Fair Value, Measurements, Recurring | Interest rate swaps | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0 | 0
Fair Value, Measurements, Recurring | Interest rate swaption |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 573 | 0
Fair Value, Measurements, Recurring | Interest rate swaption | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0 | 0
Fair Value, Measurements, Recurring | Interest rate swaption | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 573 | 0
Fair Value, Measurements, Recurring | Interest rate swaption | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 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] |  |
Derivative asset |  | 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] |  |
Derivative asset | 2,883 | 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] |  |
Derivative asset | 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] |  |
Derivative asset | 0 | 0
Fair Value, Measurements, Recurring | TBA securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 834 | 6,239
Derivative liabilities | 974 | 0
Fair Value, Measurements, Recurring | TBA securities | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0 | 0
Derivative liabilities | 0 | 0
Fair Value, Measurements, Recurring | TBA securities | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 834 | 6,239
Derivative liabilities | 974 | 0
Fair Value, Measurements, Recurring | TBA securities | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0 | 0
Derivative liabilities | 0 | 0
Fair Value, Measurements, Recurring | Futures |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities | 0 | 1,218
Fair Value, Measurements, Recurring | Futures | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities | 0 | 1,218
Fair Value, Measurements, Recurring | Futures | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities | 0 | 0
Fair Value, Measurements, Recurring | Futures | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liabilities | $ 0 | $ 0

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