REVENUE FROM CONTRACTS WITH CUSTOMERS - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue from External Customer [Line Items]
Contract With Customer Liability	$ 2,151	$ 2,476	$ 2,071	$ 2,396
Revenues	711,548	657,653	607,693
Decrease in Contract with Customer, Liability	300
Additions To Contract Liability	$ 0	730	0
Required Visa Debit Portfolio Ratio	50.00%
Other non-interest income	$ 41,834	39,909	32,742
Insurance commissions [Member]
Revenue from External Customer [Line Items]
Revenues	3,300	$ 3,000	$ 2,400
Other non-interest income	$ 5,000
Revenue Sharing [Member]
Revenue from External Customer [Line Items]
Term of contract liability	10 years