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SECURITIES AVAILABLE FOR SALE - Narrative (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
security
Dec. 31, 2014
USD ($)
Schedule of Available-for-sale Securities [Line Items]      
Number of securities for which amortized cost exceeds fair value 46 53  
Proceeds from sales of securities available for sale | $ $ 64,742 $ 65,611 $ 169,573
Gross gains on sales of securities | $ 1,468 1,948 2,301
Gross losses sales of securities | $ 48 24 $ 366
Fair value of securities pledged | $ $ 317,282 $ 250,397  
US Government Agencies and US Government Sponsored Enterprises (GSE)      
Schedule of Available-for-sale Securities [Line Items]      
Number of securities for which amortized cost exceeds fair value 17 29  
Number of securities held, less than 12 months category 14 25  
Number of securities held, 12 months or more category 3 4  
States and political subdivisions      
Schedule of Available-for-sale Securities [Line Items]      
Number of securities for which amortized cost exceeds fair value 26 21  
Number of securities held, less than 12 months category 25 16  
Number of securities held, 12 months or more category 1 5  
Private label CMOs      
Schedule of Available-for-sale Securities [Line Items]      
Number of securities for which amortized cost exceeds fair value 3 3  
Number of securities held, less than 12 months category 3 3