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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
Mar. 31, 2020
Dec. 31, 2019
Economic undesignated hedges:    
Notional amount of derivatives $ 107,142 $ 94,894
Interest Rate Lock Commitments [Member]    
Economic undesignated hedges:    
Notional amount of derivatives 34,599 11,456
Forward loan sales commitments [Member]    
Economic undesignated hedges:    
Notional amount of derivatives 5,023 6,418
Sale of TBA GNMA MBS pools [Member]    
Economic undesignated hedges:    
Notional amount of derivatives 25,500 35,000
Interest Rate Cap [Member] | Written    
Economic undesignated hedges:    
Notional amount of derivatives 21,010 21,010
Interest Rate Cap [Member] | Purchase    
Economic undesignated hedges:    
Notional amount of derivatives $ 21,010 $ 21,010