SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE - Securities Sold Under Agreements to Repurchase (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	$ 300,000	$ 100,000
short term debt [member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	0	0
long term debt [member]
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase agreements	$ 300,000	$ 100,000