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Derivatives - Schedule of Notional Amounts and The Gross Fair Values of RPAs Sold and Purchased Outstanding (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Derivative [Line Items] |  |
Derivative assets - Fair value | $ 408,429 | $ 523,133
Derivative liabilities - Fair value | 382,202 | 545,885
Derivatives not designated as hedging instruments |  |
Derivative [Line Items] |  |
Notional Amount | 23,480,807 | 22,375,840
Derivative assets - Fair value | 366,014 | 517,486
Derivative liabilities - Fair value | 381,192 | 510,674
Credit contracts | Derivatives not designated as hedging instruments |  |
Derivative [Line Items] |  |
Notional Amount | 210,205 | 168,999
Derivative assets - Fair value | 17 | 1
Derivative liabilities - Fair value | 58 | 12
Credit contracts | Derivatives not designated as hedging instruments | RPAs — protection sold |  |
Derivative [Line Items] |  |
Notional Amount | 146,126 | 133,174
Derivative assets - Fair value | 0 | 0
Derivative liabilities - Fair value | $ 58 | $ 12
Weighted average remaining maturity of outstanding RPAs | 2 years 3 months 18 days | 1 year 7 months 6 days
Credit contracts | Derivatives not designated as hedging instruments | RPAs — protection purchased |  |
Derivative [Line Items] |  |
Notional Amount | $ 64,079 | $ 35,825
Derivative assets - Fair value | 17 | 1
Derivative liabilities - Fair value | $ 0 | $ 0

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