REVENUE FROM CONTRACT WITH CUSTOMERS - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Revenue from External Customer [Line Items]
Contract liability	$ 2,233	$ 1,828	$ 2,233	$ 1,828	$ 2,314	$ 2,476	$ 1,909	$ 2,071
Revenue	178,630	165,826	503,581	493,319
Other non-interest income	10,132	$ 9,411	29,263	28,277
Hurricane [Member]
Revenue from External Customer [Line Items]
Other non-interest income	$ 5,000		5,000
Insurance commissions [Member]
Revenue from External Customer [Line Items]
Revenue			$ 3,300	$ 3,000