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Derivative Financial Instruments - Aggregate Fair Value and Notional Amount of Derivative Financial Instruments (Details) - USD ($) | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Derivative [Line Items] |  |
Fair Value | $ 31,800,000 | $ 23,150,000
Notional Amount | 9,842,443,000 | 6,861,921,000
TBAs |  |
Derivative [Line Items] |  |
Notional Amount | 7,940,000,000 | 3,310,000,000
Interest rate futures |  |
Derivative [Line Items] |  |
Notional Amount | 281,000,000 | 72,000,000
Derivative Liabilities |  |
Derivative [Line Items] |  |
Fair Value | (80,260,000) | (3,317,000)
Notional Amount | 4,596,748,000 | 1,619,790,000
Derivative Liabilities | Interest rate swaps |  |
Derivative [Line Items] |  |
Fair Value | (650,000) | (1,251,000)
Notional Amount | 66,000,000 | 283,100,000
Derivative Liabilities | TBAs |  |
Derivative [Line Items] |  |
Fair Value | (64,883,000) | (658,000)
Notional Amount | 3,535,000,000 | 870,000,000
Derivative Liabilities | Interest rate futures |  |
Derivative [Line Items] |  |
Fair Value | (236,000) | (905,000)
Notional Amount | 83,000,000 | 62,500,000
Derivative Liabilities | Residential loan purchase commitments, net |  |
Derivative [Line Items] |  |
Fair Value | (14,491,000) | (503,000)
Notional Amount | 912,748,000 | 404,190,000
Derivative Assets |  |
Derivative [Line Items] |  |
Fair Value | 112,060,000 | 26,467,000
Notional Amount | 5,245,695,000 | 5,242,131,000
Derivative Assets | Interest rate swaps |  |
Derivative [Line Items] |  |
Fair Value | 11,412,000 | 611,000
Notional Amount | 460,000,000 | 161,500,000
Derivative Assets | TBAs |  |
Derivative [Line Items] |  |
Fair Value | 95,631,000 | 2,880,000
Notional Amount | 4,400,000,000 | 2,440,000,000
Derivative Assets | Interest rate futures |  |
Derivative [Line Items] |  |
Fair Value | 2,907,000 | 25,000
Notional Amount | 197,800,000 | 9,000,000
Derivative Assets | Swaptions |  |
Derivative [Line Items] |  |
Fair Value | 0 | 18,318,000
Notional Amount | 0 | 1,660,000,000
Derivative Assets | Residential loan purchase commitments, net |  |
Derivative [Line Items] |  |
Fair Value | 2,110,000 | 4,633,000
Notional Amount | $ 187,895,000 | $ 971,631,000

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