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, 2020	Dec. 31, 2019
Economic undesignated hedges:
Derivative Notional Amount	$ 126,793	$ 94,894
Sale of TBA GNMA MBS pools
Economic undesignated hedges:
Derivative Notional Amount	42,000	35,000
Forward loan sales commitments [Member]
Economic undesignated hedges:
Derivative Notional Amount	19,998	6,418
Interest Rate Lock Commitments [Member]
Economic undesignated hedges:
Derivative Notional Amount	19,931	11,456
Interest Rate Cap [Member] | Written [Member]
Economic undesignated hedges:
Derivative Notional Amount	14,500	21,010
Interest Rate Cap [Member] | Purchase [Member]
Economic undesignated hedges:
Derivative Notional Amount	14,500	21,010
Interest Rate Swap [Member]
Economic undesignated hedges:
Derivative Notional Amount	$ 15,864	$ 0