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Derivative Hedging Instruments - Summary of Interest Rate Swap Transactions (Detail) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015
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 | $ 53,373,000 | $ 35,534,000
Weighted Average Rate Received(Paid) | 5.07% | 5.31%
Net Exposure, Impact of a 1 basis point change in interest rates | $ 33,000 | $ 20,000
Repricing Frequency | Monthly |
Derivative Financial Instruments, Liabilities [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Net Exposure, Notional Amount | $ (53,373,000) | $ (35,534,000)
Weighted Average Rate Received(Paid) | 5.07% | 5.31%
Net Exposure, Impact of a 1 basis point change in interest rates | $ (33,000) | $ (20,000)
Repricing Frequency | Monthly |

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