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INVESTMENT SECURITIES - Additional Information (Detail)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
security
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
security
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
security
Investments, Debt and Equity Securities [Abstract]          
Held-to-maturity securities transferred | $ $ 740,900,000   $ 740,900,000    
Increase to AOCI from transfer | $ 22,000,000        
Securities available for sale, pledged | $ 767,100,000   767,100,000   $ 581,800,000
OTTI on investment securities | $ $ 0 $ 0 $ 0 $ 0  
Securities available for sale portfolio | security 223   223   161
Available for sale securities in unrealized loss position | security 61   61   59
Securities held to maturity portfolio | security         87
Held to maturity securities in unrealized loss position | security         15