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Other Assets - Impact of Derivative Instruments on Earnings (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Derivative [Line Items] |  |  |  |
Income on swap variable receive leg | $ 37,784 | $ 4,899 | $ 71,635 | $ 5,306
Expense on swap fixed pay leg | (11,819) | (9,172) | (23,853) | (15,108)
Net price alignment expense on margin collateral received | (2,532) | 0 | (4,810) | 0
Net gain on TBA short positions | 0 | 20,310 | 0 | 39,186
Total Net (loss)/gain on derivatives used for risk management purposes | 60,451 | 47,804 | 39,243 | 141,905
Agreements with mark-to-market collateral provisions |  |  |  |
Derivative [Line Items] |  |  |  |
Unrealized mark-to-market (loss)/gain | $ 37,018 | $ 31,767 | $ (3,729) | $ 112,521

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