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, 2019	Dec. 31, 2018
Economic undesignated hedges:
Notional amount of derivatives	$ 175,384	$ 188,081
Interest Rate Lock Commitments [Member]
Economic undesignated hedges:
Notional amount of derivatives	9,301	11,722
Forward loan sales commitments [Member]
Economic undesignated hedges:
Notional amount of derivatives	2,063	6,339
Sale of TBA GNMA MBS pools [Member]
Economic undesignated hedges:
Notional amount of derivatives	28,000	33,000
Interest Rate Cap [Member] | Written
Economic undesignated hedges:
Notional amount of derivatives	68,010	68,510
Interest Rate Cap [Member] | Purchase
Economic undesignated hedges:
Notional amount of derivatives	$ 68,010	$ 68,510