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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