CREDIT QUALITY ASSESSMENT - Collateral Dependent Loans (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Credit Loss [Abstract]
Collateral dependent loans individually evaluated for credit loss with an allowance	$ 25,823	$ 15,333
Collateral dependent loans individually evaluated for credit loss without an allowance	30,299	9,440
Total individually evaluated collateral dependent loans	56,122	24,773
Allowance for credit losses related to loans evaluated individually	8,263	5,501
Allowance for credit losses related to loans evaluated collectively	162,051	50,631
Total allowance for credit losses	$ 170,314	$ 56,132	$ 54,992	$ 53,486