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STOCKHOLDERS' EQUITY - Changes to Accumulate Other Comprehensive Income by Components (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Unrealized gain arising from the reclassification of securities held-to-maturity to securities available-for-sale $ 22,000      
Unrealized (loss) gain on securities available-for -sale        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at beginning of period   $ (24,117) $ 5,227 $ (9,042)
Unrealized (loss) gain arising during the period   11,734 (40,476) 16,334
Unrealized gain arising from the reclassification of securities held-to-maturity to securities available-for-sale   0 0 21,990
Reclassification adjustment from other comprehensive income   4,852 (5,532) (14,768)
Amounts reclassified from accumulated other comprehensive income (loss) to net income   731 3,252 0
Tax effect of current period changes   (5,100) 12,916 (9,287)
Total changes, net of taxes   12,217 (29,840) 14,269
Reclassification of stranded tax effects to retained earnings   0 496 0
Balance at end of period   $ (11,900) $ (24,117) $ 5,227