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Derivative Hedging Instruments - Summary of Interest Rate Swap Transactions (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Net Exposure, Notional Amount | $ 0 | $ 0
Derivative Financial Instruments, Assets [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Net Exposure, Notional Amount | $ 66,227,000 | $ 52,975,000
Weighted Average Rate Received/(Paid) | 5.08% | 5.07%
Net Exposure, Impact of a 1 basis point change in interest rates | $ 36,000 | $ 30,000
Repricing Frequency | Monthly |
Derivative Financial Instruments, Liabilities [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Net Exposure, Notional Amount | $ (66,227,000) | $ (52,975,000)
Weighted Average Rate Received/(Paid) | 5.08% | 5.07%
Net Exposure, Impact of a 1 basis point change in interest rates | $ (36,000) | $ (30,000)
Repricing Frequency | Monthly |

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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 + Details
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