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Derivative Hedging Instruments - Summary of Interest Rate Swap Transactions (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
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 $ 130,429,000 $ 120,131,000
Weighted Average Rate Received/(Paid) 5.18% 5.19%
Net Exposure, Impact of a 1 basis point change in interest rates $ 80,000 $ 72,000
Repricing Frequency Monthly Monthly
Derivative Financial Instruments, Liabilities [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Net Exposure, Notional Amount $ (130,429,000) $ (120,131,000)
Weighted Average Rate Received/(Paid) 5.18% 5.19%
Net Exposure, Impact of a 1 basis point change in interest rates $ (80,000) $ (72,000)
Repricing Frequency Monthly Monthly