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Short-Term Borrowings - Summary of Short-Term Borrowings (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 900 | $ 500
Weighted average interest rate | 0.97% | 0.38%
Federal Funds Purchased [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 900 | $ 500
Short-term Debt [Member] |  |
Short-term Debt [Line Items] |  |
End of period interest rate | 1.38% | 0.63%

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- Definition Weighted average interest rate of short-term debt outstanding calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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