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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Derivative [Line Items] |  |
Fair Value | $ 58,431 | $ 23,150
Notional Amount | 2,116,501 | 6,861,921
TBAs |  |
Derivative [Line Items] |  |
Notional Amount | 820,000 | 3,310,000
Interest rate futures |  |
Derivative [Line Items] |  |
Notional Amount | 682,000 | 72,000
Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (6,782) | (3,317)
Notional Amount | 323,844 | 1,619,790
Derivative Liabilities | Interest rate swaps |  |
Derivative [Line Items] |  |
Fair Value | (23) | (1,251)
Notional Amount | 10,000 | 283,100
Derivative Liabilities | TBAs |  |
Derivative [Line Items] |  |
Fair Value | (6,545) | (658)
Notional Amount | 255,000 | 870,000
Derivative Liabilities | Interest rate futures |  |
Derivative [Line Items] |  |
Fair Value | (2) | (905)
Notional Amount | 300 | 62,500
Derivative Liabilities | Residential loan purchase commitments, net |  |
Derivative [Line Items] |  |
Fair Value | (212) | (503)
Notional Amount | 58,544 | 404,190
Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 65,213 | 26,467
Notional Amount | 1,792,657 | 5,242,131
Derivative Assets | Interest rate swaps |  |
Derivative [Line Items] |  |
Fair Value | 24,626 | 611
Notional Amount | 459,000 | 161,500
Derivative Assets | TBAs |  |
Derivative [Line Items] |  |
Fair Value | 13,568 | 2,880
Notional Amount | 565,000 | 2,440,000
Derivative Assets | Interest rate futures |  |
Derivative [Line Items] |  |
Fair Value | 26,275 | 25
Notional Amount | 681,500 | 9,000
Derivative Assets | Swaptions |  |
Derivative [Line Items] |  |
Fair Value | 0 | 18,318
Notional Amount | 0 | 1,660,000
Derivative Assets | Residential loan purchase commitments, net |  |
Derivative [Line Items] |  |
Fair Value | 744 | 4,633
Notional Amount | $ 87,157 | $ 971,631

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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 https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 + Details
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