Offsetting Assets and Liabilities - Offsetting Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
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
Cash Collateral Pledged	$ (3,000)	(5,600)
Securities loaned
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	101,276
Gross Amounts Offset in the Statement of Financial Condition	0
Net Amounts of Liabilities Presented in the Statement of Financial Condition	101,276
Financial Instruments Collateral	(98,241)
Cash Collateral Pledged	0
Net Amount	3,035
Derivatives
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	12,524	16,923
Gross Amounts Offset in the Statement of Financial Condition	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Condition	12,524	16,923
Financial Instruments Collateral	0	0
Cash Collateral Pledged	(2,980)	(5,572)
Net Amount	9,544	11,351
Exchange-traded options | Short
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	0	2,774
Gross Amounts Offset in the Statement of Financial Condition	0	0
Net Amounts of Liabilities Presented in the Statement of Financial Condition	0	2,774
Financial Instruments Collateral	0	0
Cash Collateral Pledged	0	0
Net Amount	$ 0	$ 2,774