SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE - Schedule of Repurchase Agreement Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Securities Sold Under Agreements To Repurchase [Line Items]
Securities Sold Under Agreements To Repurchase	$ 300,000	$ 100,000
Over one year to three years
Securities Sold Under Agreements To Repurchase [Line Items]
Securities Sold Under Agreements To Repurchase	100,000
Over three years to five years
Securities Sold Under Agreements To Repurchase [Line Items]
Securities Sold Under Agreements To Repurchase	$ 200,000