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STOCKHOLDERS' EQUITY - Changes to Accumulate Other Comprehensive Income by Components (Details) - Unrealized (loss) gain on securities available-for -sale - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at beginning of period $ (11,900) $ (24,117) $ 5,227
Unrealized gain (loss) arising during the period 29,867 11,734 (40,476)
Reclassification adjustment from other comprehensive income (2,011) 4,852 (5,532)
Amounts reclassified from accumulated other comprehensive income (loss) to net income 0 731 3,252
Tax effect of current period changes (8,210) (5,100) 12,916
Total changes, net of taxes 19,646 12,217 (29,840)
Reclassification of stranded tax effects to retained earnings 0 0 496
Balance at end of period $ 7,746 $ (11,900) $ (24,117)