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STOCKHOLDERS' EQUITY - Changes to Accumulated Other Comprehensive (Loss) Income by Components (Detail) - Gain (loss) on securities available-for-sale - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Balance at beginning of period $ 7,746 $ (11,900)
Unrealized loss arising during the period (3,638) (59,885)
Tax effect of current period changes 1,077 17,637
Total changes, net of taxes (2,561) (42,248)
Balance at end of period $ 5,185 $ (54,148)