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Fair Value Measurements (Details) - Recurring basis - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Level 1 - Quoted Prices in Active Markets for Identical Assets |  |
Fair value |  |
Trading investment securities | $ 1,753 | $ 1,980
Total assets measured at fair value on a recurring basis | 1,753 | 1,980
Level 2 - Significant Other Observable Inputs |  |
Fair value |  |
Trading investment securities | 0 | 0
Total assets measured at fair value on a recurring basis | 0 | 0
Level 3 - Significant Unobservable Inputs |  |
Fair value |  |
Trading investment securities | 0 | 0
Total assets measured at fair value on a recurring basis | 0 | 0
Total |  |
Fair value |  |
Trading investment securities | 1,753 | 1,980
Total assets measured at fair value on a recurring basis | $ 1,753 | $ 1,980

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- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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