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Investments - Summary of Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Investment [Line Items] |  |
Investment securities - fair value | $ 59,271 |
Investment securities - available for sale | 2,023 | $ 20,662
Parent |  |
Investment [Line Items] |  |
Investment securities - fair value | 59,271 | 69,101
Investment securities - available for sale | 2,023 | 20,662
Equity method investments | 10,573 | 11,098
Nonqualified retirement plan assets | 6,716 | 6,706
Other investments | 975 | 925
Total investments | $ 79,558 | $ 108,492

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