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Derivative Hedging Instruments - Summary of Interest Rate Swap Transactions (Detail) - USD ($)
 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
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 $ 30,802,000 $ 29,060,000
Weighted Average Rate Received(Paid) 5.41% 5.47%
Net Exposure, Impact of a 1 basis point change in interest rates $ 18,000 $ 19,000
Repricing Frequency Monthly  
Derivative Financial Instruments, Liabilities [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Net Exposure, Notional Amount $ (30,802,000) $ (29,060,000)
Weighted Average Rate Received(Paid) 5.41% 5.47%
Net Exposure, Impact of a 1 basis point change in interest rates $ (18,000) $ (19,000)
Repricing Frequency Monthly