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INVESTMENT SECURITIES - Additional Information (Detail)
$ in Thousands
Sep. 30, 2015
USD ($)
security
Dec. 31, 2014
USD ($)
Schedule of Available-for-sale Securities [Line Items]    
Securities available for sale, pledged $ 263,500 $ 27,100
Securities available for sale portfolio | security 106  
Available for sale securities in unrealized loss position | security 28  
Securities held to maturity portfolio | security 43  
Held to maturity securities in unrealized loss position | security 27  
Amount of rated securities available for sale portfolio $ 693,219 345,695
Fair value of held to maturity securities 526,958  
Amount of rated securities held to maturity portfolio 529,532 $ 0
AAA, AA or A    
Schedule of Available-for-sale Securities [Line Items]    
Amount of rated securities available for sale portfolio 665,900  
Amount of rated securities held to maturity portfolio 289,900  
BBB    
Schedule of Available-for-sale Securities [Line Items]    
Amount of rated securities available for sale portfolio 27,300  
Amount of rated securities held to maturity portfolio $ 237,000