SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE - Securities Sold Under Agreements to Repurchase (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Securities Sold Under Agreements To Repurchase [Line Items]
Repurchase agreements	$ 300,000	$ 100,000
Short-term Debt [Member]
Securities Sold Under Agreements To Repurchase [Line Items]
Repurchase agreements	0	0
Long-term Debt [Member]
Securities Sold Under Agreements To Repurchase [Line Items]
Repurchase agreements	$ 300,000	$ 100,000