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STOCKHOLDERS' EQUITY - Changes to Accumulate Other Comprehensive Income by Components (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Gain (loss) on securities available-for-sale        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at beginning of period $ (9,702) $ 2,835 $ (9,042) $ (2,995)
Reclassification adjustment from other comprehensive income (1,099) (12,824) (4,455) (29,613)
Tax effect of current period changes (13,231) 107 (12,761) (4,083)
Total changes, net of taxes 18,583 (152) 17,923 5,678
Balance at end of period 8,881 2,683 8,881 2,683
Excluding reclassification of held-to-maturity securities to available-for-sale securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Unrealized gain arising during the period 10,923 12,565 13,149 39,374
Reclassification of held-to-maturity securities to available-for-sale securities        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Unrealized gain arising during the period $ 21,990 $ 0 $ 21,990 $ 0