Investment Securities - Narrative (Details)	9 Months Ended
	Sep. 30, 2023 USD ($) investment	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Schedule of Equity Method Investments [Line Items]
Total long-term investments	$ 45,743,000		$ 44,959,000
Cash distributions received	4,062,000	$ 4,953,000
In-transit redemptions	88,000
Investment	$ 5,000,000
Number of investments not qualify for the NAV practical expedient | investment	2,000
Equity securities and other long-term investments at cost	$ 7,755,000		$ 2,755,000
Impairment and other adjustments	$ 0	$ 0
Minimum | Mutual Fund And Hedge Funds
Schedule of Equity Method Investments [Line Items]
Equity-method ownership percentage	7.40%
Maximum | Mutual Fund And Hedge Funds
Schedule of Equity Method Investments [Line Items]
Equity-method ownership percentage	38.67%
Quoted Prices in Active Markets for Identical Assets (Level 1)
Schedule of Equity Method Investments [Line Items]
Total long-term investments	$ 303,000