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

Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Investments In Nonqualified Retirement Plan Assets

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