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Fair Value of Assets and Liabilities - Investments in small business investment company funds (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Fair Value of Assets and Liabilities      
Fair value of investment in small business investment companies $ 1,440   $ 1,480
Unrealized gains or losses $ 45 $ 0