DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Notional Amounts of All Derivative Instruments (Detail) - Not Designated as Hedging Instrument, Economic Hedge [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Economic undesignated hedges:
Derivative Notional Amount	$ 188,081	$ 208,020
Sale of TBA GNMA MBS pools
Economic undesignated hedges:
Derivative Notional Amount	33,000	26,000
Forward loan sales commitments [Member]
Economic undesignated hedges:
Derivative Notional Amount	6,339	0
Interest Rate Lock Commitments [Member]
Economic undesignated hedges:
Derivative Notional Amount	11,722	0
Interest Rate Cap [Member] | Written [Member]
Economic undesignated hedges:
Derivative Notional Amount	68,510	91,010
Interest Rate Cap [Member] | Purchase [Member]
Economic undesignated hedges:
Derivative Notional Amount	$ 68,510	$ 91,010