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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 ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Economic undesignated hedges:    
Notional amount of derivatives $ 178,993 $ 188,081
Sale of TBA GNMA MBS pools [Member]    
Economic undesignated hedges:    
Notional amount of derivatives 30,000 33,000
Forward loan sales commitments [Member]    
Economic undesignated hedges:    
Notional amount of derivatives 3,869 6,339
Interest Rate Lock Commitments [Member]    
Economic undesignated hedges:    
Notional amount of derivatives 10,104 11,722
Interest Rate Cap [Member] | Written    
Economic undesignated hedges:    
Notional amount of derivatives 67,510 68,510
Interest Rate Cap [Member] | Purchase    
Economic undesignated hedges:    
Notional amount of derivatives $ 67,510 $ 68,510