Derivatives - Schedule of Notional Amounts and the Gross Fair Values of RPAs Sold and Purchased Outstanding (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2026	Dec. 31, 2025
Derivative [Line Items]
Derivative assets - fair value	$ 387,420	$ 409,467
Derivative liabilities - fair value	407,529	385,973
Derivatives not Designated as Hedging Instruments
Derivative [Line Items]
Notional Amount	23,326,366	23,840,799
Derivative assets - fair value	379,019	369,470
Derivative liabilities - fair value	392,824	385,834
Credit contracts | Derivatives not Designated as Hedging Instruments
Derivative [Line Items]
Notional Amount	371,665	303,421
Derivative assets - fair value	6	25
Derivative liabilities - fair value	130	51
Credit contracts | Derivatives not Designated as Hedging Instruments | RPAs — protection sold
Derivative [Line Items]
Notional Amount	203,784	133,756
Derivative assets - fair value	0	0
Derivative liabilities - fair value	$ 130	$ 51
Weighted average remaining maturity of outstanding RPAs	3 years 7 months 6 days	2 years 8 months 12 days
Credit contracts | Derivatives not Designated as Hedging Instruments | RPAs — protection purchased
Derivative [Line Items]
Notional Amount	$ 167,881	$ 169,665
Derivative assets - fair value	6	25
Derivative liabilities - fair value	$ 0	$ 0