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STOCKHOLDERS' EQUITY - Changes to Accumulate Other Comprehensive Income by Components (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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 gain (loss) on securities available-for -sale        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at beginning of period   $ 5,227 $ (9,042) $ (2,995)
Unrealized (loss) gain arising during the period   (40,476) 16,334 19,097
Unrealized gain arising from the reclassification of securities held-to-maturity to securities available-for-sale   0 21,990 0
Reclassification adjustment from other comprehensive income   5,532 14,768 29,405
Amounts reclassified from accumulated other comprehensive income (loss) to net income   3,252 0 0
Tax effect of current period changes   12,916 (9,287) 4,261
Total changes, net of taxes   (29,840) 14,269 (6,047)
Reclassification of stranded tax effects to retained earnings   496 0 0
Balance at end of period   $ (24,117) $ 5,227 $ (9,042)