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Derivative Instruments and Hedging Activities - Activity of Derivative Instruments Not Designated as Hedges (Details) - Trading - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Interest rate caps |  |
Derivative Instruments and Hedging Activities Disclosures [Roll Forward] |  |
Beginning balance | $ 550,025 |
Additions | 148,044 |
Terminations | (161,165) |
Ending balance | 536,904 |
Options |  |
Derivative Instruments and Hedging Activities Disclosures [Roll Forward] |  |
Beginning balance | 0 | $ 0
Additions | 202 | 500,053
Terminations | (102) | 0
Ending balance | 100 | 500,053
Interest rate swaps |  |
Derivative Instruments and Hedging Activities Disclosures [Roll Forward] |  |
Beginning balance | 2,778,015 | 0
Additions | 904,180 | 341,300
Terminations | (305,450) | 0
Ending balance | 3,376,745 | $ 341,300
Credit default swaps |  |
Derivative Instruments and Hedging Activities Disclosures [Roll Forward] |  |
Beginning balance | 0 |
Additions | 400,000 |
Terminations | 0 |
Ending balance | 400,000 |
U.S. Treasury futures |  |
Derivative Instruments and Hedging Activities Disclosures [Roll Forward] |  |
Beginning balance | 0 |
Additions | 280,750 |
Terminations | (255,450) |
Ending balance | $ 25,300 |

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- Definition Derivative Asset (Liability), Notional Amount + References No definition available. + Details
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- Definition Additions for notional amount of other derivatives.. + References No definition available. + Details
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- Definition Settlement, expiration, or exercise for notional amount of other derivatives. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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