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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Gain (loss) on securities available-for-sale        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at beginning of period $ 8,881 $ 2,683 $ (9,042) $ (2,995)
Reclassification adjustment from other comprehensive income (7,625) (487) (12,080) (30,100)
Tax effect of current period changes 764 (3,110) (11,997) (7,193)
Total changes, net of taxes (1,073) 4,382 16,850 10,060
Balance at end of period 7,808 7,065 7,808 7,065
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 5,788 7,979 18,937 47,353
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 $ 0 $ 0 $ 21,990 $ 0