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Securities - Trading Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Debt and Equity Securities, FV-NI [Line Items] |  |
Trading securities | $ 7,545 | $ 7,150
Corporate equity securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Trading securities | 5,398 | 5,125
Mutual funds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Trading securities | 1,626 | 1,499
Corporate notes and bonds |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Trading securities | 248 | 254
U.S. Gov’t sponsored entities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Trading securities | 51 | 52
Certificates of deposit |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Trading securities | $ 222 | $ 220

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- Definition Line items represent financial 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. + References No definition available. + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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