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STOCKHOLDERS' EQUITY - Changes to Accumulate Other Comprehensive Income by Components (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 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    
Gain (loss) on securities available-for-sale        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at beginning of period $ (19,370) 8,881 $ 5,227 $ (9,042)
Unrealized (loss) gain arising during the period (3,633) 5,788 (34,111) 18,937
Unrealized gain arising from the reclassification of securities held-to-maturity to securities available-for-sale 0 0 0 21,990
Reclassification adjustment from other comprehensive income (13) (7,625) (5,532) (12,080)
Tax effect of current period changes 1,069 764 11,973 (11,997)
Total changes, net of taxes (2,577) (1,073) (27,670) 16,850
Reclassification of stranded tax effects to retained earnings 0 0 496 0
Balance at end of period $ (21,947) $ 7,808 $ (21,947) $ 7,808