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Investment Securities - Investments, Debt and Equity Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]    
Investments in equity securities $ 4,197 $ 7,543
Investments in equity securities accounted for under the equity method 2,540 16,335
Total investment securities $ 6,737 $ 23,878