REGULATORY MATTERS - Summary of Commitments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Commercial Letters Of Credit [Member]
Other Commitments [Line Items]
Commitmets to extend credit	$ 135,987	$ 82,281
Standby letters of credit [Member] [Member]
Other Commitments [Line Items]
Commitmets to extend credit	4,964	4,452
Commercial lines of credit [Member]
Other Commitments [Line Items]
Commitmets to extend credit	759,947	533,230
Unused personal lines of credit [Member]
Other Commitments [Line Items]
Commitmets to extend credit	1,180,860	722,761
Construction undisbursed funds [Member]
Other Commitments [Line Items]
Commitmets to extend credit	$ 119,900	$ 185,569