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Investment Securities - Investments, Debt and Equity Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]    
Investments in equity securities $ 7,268 $ 5,857
Investments in equity securities accounted for under the equity method 15,170 12,252
Total investment securities $ 22,438 $ 18,109