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Investments - Summary of Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Schedule of Investments [Line Items] |  |
Investment securities - fair value | $ 31,641 | $ 60,990
Parent |  |
Schedule of Investments [Line Items] |  |
Investment securities - fair value | 31,641 | 60,990
Equity method investments | 12,039 | 12,030
Nonqualified retirement plan assets | 9,302 | 8,724
Other investments | 1,464 | 1,462
Total investments | $ 54,446 | $ 83,206

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