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Derivative Hedging Instruments - Summary of Interest Rate Swap Transactions (Detail) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 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 | $ 60,711,000 | $ 52,975,000
Weighted Average Rate Received/(Paid) | 5.09% | 5.07%
Net Exposure, Impact of a 1 basis point change in interest rates | $ 35,000 | $ 30,000
Repricing Frequency | Monthly |
Derivative Financial Instruments, Liabilities [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Net Exposure, Notional Amount | $ (60,711,000) | $ (52,975,000)
Weighted Average Rate Received/(Paid) | 5.09% | 5.07%
Net Exposure, Impact of a 1 basis point change in interest rates | $ (35,000) | $ (30,000)
Repricing Frequency | Monthly |

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