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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative [Line Items] |  |
Fair Value | $ 31,065,000 | $ 37,166,000
Notional Amount | 6,499,482,000 | 11,346,407,000
TBAs |  |
Derivative [Line Items] |  |
Notional Amount | 1,460,000,000 | 6,630,000,000
Interest rate futures |  |
Derivative [Line Items] |  |
Notional Amount | 222,000,000 |
Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (3,240,000) | (16,072,000)
Notional Amount | 1,122,471,000 | 3,582,153,000
Derivative Liabilities | Interest rate swaps |  |
Derivative [Line Items] |  |
Fair Value | (957,000) | 0
Notional Amount | 87,500,000 | 0
Derivative Liabilities | TBAs |  |
Derivative [Line Items] |  |
Fair Value | (1,367,000) | (15,495,000)
Notional Amount | 730,000,000 | 3,105,000,000
Derivative Liabilities | Interest rate futures |  |
Derivative [Line Items] |  |
Fair Value | (194,000) | 0
Notional Amount | 140,000,000 | 0
Derivative Liabilities | Residential loan purchase commitments, net |  |
Derivative [Line Items] |  |
Fair Value | (722,000) | (577,000)
Notional Amount | 164,971,000 | 477,153,000
Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 34,305,000 | 53,238,000
Notional Amount | 5,377,011,000 | 7,764,254,000
Derivative Assets | Interest rate swaps |  |
Derivative [Line Items] |  |
Fair Value | 264,000 | 224,000
Notional Amount | 133,000,000 | 42,000,000
Derivative Assets | TBAs |  |
Derivative [Line Items] |  |
Fair Value | 2,064,000 | 18,260,000
Notional Amount | 730,000,000 | 3,520,000,000
Derivative Assets | Interest rate futures |  |
Derivative [Line Items] |  |
Fair Value | 304,000 | 0
Notional Amount | 81,500,000 | 0
Derivative Assets | Swaptions |  |
Derivative [Line Items] |  |
Fair Value | 17,482,000 | 19,727,000
Notional Amount | 2,100,000,000 | 1,585,000,000
Derivative Assets | Residential loan purchase commitments, net |  |
Derivative [Line Items] |  |
Fair Value | 14,191,000 | 15,027,000
Notional Amount | $ 2,332,511,000 | $ 2,617,254,000

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