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SHORT-TERM BORROWINGS - Summary of the Use of Securities Sold Under Agreements to Repurchase (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]      
Balance at year-end $ 19,466 $ 8,269 $ 9,069
Weighted average interest rate at year-end 0.23% 1.31% 1.22%
Average balance during the year $ 18,064 $ 8,830 $ 9,715
Average interest rate during the year 0.47% 1.28% 0.82%
Maximum month-end balance during the year $ 24,403 $ 12,774 $ 14,591
Fair value of securities underlying the agreements at year-end $ 29,477 $ 13,062 $ 17,942