Offsetting Assets and Liabilities - Offsetting Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Offsetting Liabilities [Line Items]
Cash Collateral Pledged	$ 0	$ (5,600)
Securities loaned
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities		23,911
Gross Amounts Offset in the Statement of Financial Condition		0
Net Amounts of Liabilities Presented in the Statement of Financial Condition		23,911
Financial Instruments Collateral		(23,373)
Cash Collateral Pledged		0
Net Amount		538
Derivatives
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	11,758	16,923
Gross Amounts Offset in the Statement of Financial Condition	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Condition	11,758	16,923
Financial Instruments Collateral	0	0
Cash Collateral Pledged	0	(5,572)
Net Amount	11,758	11,351
Short exchange-traded options | Short
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	192	2,774
Gross Amounts Offset in the Statement of Financial Condition	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Condition	192	2,774
Financial Instruments Collateral	0	0
Cash Collateral Pledged	0	0
Net Amount	$ 192	$ 2,774