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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative [Line Items] |  |
Fair Value | $ 40,131,000 | $ 37,166,000
Notional Amount | 8,968,793,000 | 11,346,407,000
TBAs |  |
Derivative [Line Items] |  |
Notional Amount | 4,400,000,000 | 6,630,000,000
Interest rate futures |  |
Derivative [Line Items] |  |
Notional Amount | 133,000,000 |
Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (10,972,000) | (16,072,000)
Notional Amount | 3,448,279,000 | 3,582,153,000
Derivative Liabilities | Interest rate swaps |  |
Derivative [Line Items] |  |
Fair Value | (74,000) | 0
Notional Amount | 40,500,000 | 0
Derivative Liabilities | TBAs |  |
Derivative [Line Items] |  |
Fair Value | (7,599,000) | (15,495,000)
Notional Amount | 2,190,000,000 | 3,105,000,000
Derivative Liabilities | Interest rate futures |  |
Derivative [Line Items] |  |
Fair Value | (749,000) | 0
Notional Amount | 133,200,000 | 0
Derivative Liabilities | Residential loan purchase commitments, net |  |
Derivative [Line Items] |  |
Fair Value | (2,550,000) | (577,000)
Notional Amount | 1,084,579,000 | 477,153,000
Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 51,103,000 | 53,238,000
Notional Amount | 5,520,514,000 | 7,764,254,000
Derivative Assets | Interest rate swaps |  |
Derivative [Line Items] |  |
Fair Value | 3,213,000 | 224,000
Notional Amount | 293,200,000 | 42,000,000
Derivative Assets | TBAs |  |
Derivative [Line Items] |  |
Fair Value | 8,213,000 | 18,260,000
Notional Amount | 2,205,000,000 | 3,520,000,000
Derivative Assets | Swaptions |  |
Derivative [Line Items] |  |
Fair Value | 30,415,000 | 19,727,000
Notional Amount | 1,335,000,000 | 1,585,000,000
Derivative Assets | Residential loan purchase commitments, net |  |
Derivative [Line Items] |  |
Fair Value | 9,262,000 | 15,027,000
Notional Amount | $ 1,687,314,000 | $ 2,617,254,000

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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 + Details
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