DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Effect of Derivative Instruments on Statement of Income (Loss) (Detail) - Not Designated as Hedging Instrument, Economic Hedge [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Economic undesignated hedges:
Total gain (loss) on derivatives	$ 512	$ 471	$ 46
Sale of TBA GNMA MBS pools | Mortgage Banking Activities
Economic undesignated hedges:
Total gain (loss) on derivatives	(54)	245	(371)
Forward loan sales commitments [Member] | Mortgage Banking Activities
Economic undesignated hedges:
Total gain (loss) on derivatives	(37)	8	12
Interest Rate Lock Commitments [Member] | Mortgage Banking Activities
Economic undesignated hedges:
Total gain (loss) on derivatives	576	224	383
Interest Rate Cap [Member] | Mortgage Banking Activities | Interest Income Member
Economic undesignated hedges:
Total gain (loss) on derivatives	0	(6)	22
Interest Rate Swap [Member] | Interest Income Member
Economic undesignated hedges:
Total gain (loss) on derivatives	$ 27	$ 0	$ 0