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Fair Value Measurements (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair value |  |
Investment securities - trading | $ 1,405 | $ 1,308
Recurring basis |  |
Fair value |  |
Investment securities - trading | 1,405 | 1,308
Total assets measured at fair value on a recurring basis | 1,405 | 1,308
Recurring basis | Level 1 - Quoted Prices in Active Markets for Identical Assets |  |
Fair value |  |
Investment securities - trading | 1,405 | 1,308
Total assets measured at fair value on a recurring basis | 1,405 | 1,308
Recurring basis | Level 2 - Significant Other Observable Inputs |  |
Fair value |  |
Investment securities - trading | 0 | 0
Total assets measured at fair value on a recurring basis | 0 | 0
Recurring basis | Level 3 - Significant Unobservable Inputs |  |
Fair value |  |
Investment securities - trading | 0 | 0
Total assets measured at fair value on a recurring basis | $ 0 | $ 0

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Amount of restricted investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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