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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | $ 70,098 | $ 11,342
Derivative liabilities | 12,584 | 1,634
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgage-backed securities | 2,858,166 | 2,596,255
Mortgage loans held for investment, at fair value | 4,717 | 6,264
Assets, Fair Value Disclosure | 2,932,981 | 2,613,861
Financial Liabilities Fair Value Disclosure | 12,584 | 1,634
Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgage-backed securities | 0 | 0
Mortgage loans held for investment, at fair value | 0 | 0
Assets, Fair Value Disclosure | 60,159 | 1,094
Financial Liabilities Fair Value Disclosure | 0 | 1,527
Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgage-backed securities | 2,857,260 | 2,594,980
Mortgage loans held for investment, at fair value | 0 | 0
Assets, Fair Value Disclosure | 2,867,199 | 2,605,228
Financial Liabilities Fair Value Disclosure | 12,584 | 107
Fair Value, Measurements, Recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Mortgage-backed securities | 906 | 1,275
Mortgage loans held for investment, at fair value | 4,717 | 6,264
Assets, Fair Value Disclosure | 5,623 | 7,539
Financial Liabilities Fair Value Disclosure | 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 | 1,094
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 | 0 | 1,094
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 | Interest rate swaption |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 9,939 | 1,360
Derivative liabilities |  | 107
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
Derivative liabilities |  | 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 | 9,939 | 1,360
Derivative liabilities |  | 107
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
Derivative liabilities |  | 0
Fair Value, Measurements, Recurring | Futures |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 60,159 |
Derivative liabilities |  | 1,527
Fair Value, Measurements, Recurring | Futures | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 60,159 |
Derivative liabilities |  | 1,527
Fair Value, Measurements, Recurring | Futures | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0 |
Derivative liabilities |  | 0
Fair Value, Measurements, Recurring | Futures | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0 |
Derivative liabilities |  | 0
Fair Value, Measurements, Recurring | TBA securities | Long position |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0 | 8,888
Derivative liabilities | 12,584 |
Fair Value, Measurements, Recurring | TBA securities | Level 1 | Long position |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0 | 0
Derivative liabilities | 0 |
Fair Value, Measurements, Recurring | TBA securities | Level 2 | Long position |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0 | 8,888
Derivative liabilities | 12,584 |
Fair Value, Measurements, Recurring | TBA securities | Level 3 | Long position |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset | 0 | $ 0
Derivative liabilities | $ 0 |

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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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