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Derivative Hedging Instruments - Summary of Interest Rate Swap Transactions (Detail) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
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 | $ 95,211,000 | $ 66,227,000
Weighted Average Rate Received/(Paid) | 5.29% | 5.08%
Net Exposure, Impact of a 1 basis point change in interest rates | $ 55,000 | $ 36,000
Repricing Frequency | Monthly | Monthly
Derivative Financial Instruments, Liabilities [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Net Exposure, Notional Amount | $ (95,211,000) | $ (66,227,000)
Weighted Average Rate Received/(Paid) | 5.29% | 5.08%
Net Exposure, Impact of a 1 basis point change in interest rates | $ (55,000) | $ (36,000)
Repricing Frequency | Monthly | Monthly

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