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Fair Value of Assets and Liabilities - Investments in small business investment company funds (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Fair Value of Assets and Liabilities          
Fair value of investment in small business investment companies $ 1,420,000   $ 1,420,000   $ 1,480,000
Unrealized gains or losses $ 88,000 $ 40,000 $ 135,000 $ (84,000)