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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at beginning of period $ 5,185 $ (54,148) $ 7,746 $ (11,900)
Unrealized gain (loss) arising during the period 13,550 56,701 9,912 (3,182)
Reclassification adjustment from other comprehensive income 0 (2,011) 0 (2,011)
Tax effect of current period changes (3,995) (16,107) (2,918) 1,528
Total changes, net of taxes 9,555 38,583 6,994 (3,665)
Balance at end of period $ 14,740 $ (15,565) $ 14,740 $ (15,565)