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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Notional Amounts of All Derivative Instruments (Detail) - Not Designated as Hedging Instrument, Economic Hedge [Member] - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Economic undesignated hedges:    
Notional amount of derivatives $ 212,025,000 $ 208,020,000
Forward Contracts [Member]    
Economic undesignated hedges:    
Notional amount of derivatives 28,000,000 26,000,000
Forward loan sales commitments [Member]    
Economic undesignated hedges:    
Notional amount of derivatives 5,005,000 0
Interest Rate Cap [Member] | Written    
Economic undesignated hedges:    
Notional amount of derivatives 89,510,000 91,010,000
Interest Rate Cap [Member] | Purchase    
Economic undesignated hedges:    
Notional amount of derivatives $ 89,510,000 $ 91,010,000