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Fair Value of Assets and Liabilities - Investments in Other investment company funds (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Fair value of investment in Other investments companies	$ 2,160,000	$ 2,160,000	$ 1,470,000
Unrealized gains or losses		(204,000)	$ 172,000
Fair value of investments	3,650,000	3,650,000
Unrealized gains from change in fair value of investments		$ 2,860,000
ASU 2022-03
Other income	2,700,000
Other income net of tax	2,200,000
ASU 2022-03 | Change in accounting policy for investments
Other income	2,700,000
Other income net of tax	$ 2,200,000

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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