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Investment Securities - Schedule of available-for-sale securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Gain (Loss) on Securities [Line Items]
Unrealized gain (loss) on investment securities held at the end of the period	$ 1,602	$ 716	$ 5,050
Investment securities	47,878	3,656
Seed Investments
Gain (Loss) on Securities [Line Items]
Net investment gain (loss) of consolidated investment products	(401)	160	5,087
Long-Term Cash Awards
Gain (Loss) on Securities [Line Items]
Net investment gain (loss) of consolidated investment products	2,716	0	0
Other Investments
Gain (Loss) on Securities [Line Items]
Net investment gain (loss) of consolidated investment products	(559)	145	1,251
Consolidated Entity Excluding Variable Interest Entities (VIE)
Gain (Loss) on Securities [Line Items]
Net investment gain (loss) of consolidated investment products	1,756	$ 305	$ 6,338
Long-Term Cash Awards
Gain (Loss) on Securities [Line Items]
Investment securities	$ 36,500

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Amount of realized and unrealized gain (loss) on investment.

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