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Fair Value of Assets and Liabilities - Investments in small business investment company funds (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Fair Value of Assets and Liabilities          
Fair value of investment in small business investment companies $ 2,410,000   $ 2,410,000   $ 1,470,000
Unrealized gains or losses $ (5,000) $ 2,000 $ 19,000 $ 47,000