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SECURITIES AVAILABLE FOR SALE - Additional Information (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
security
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
security
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
security
Schedule of Available-for-sale Securities [Line Items]          
Securities held 18   18   53
Gross gains on the sales of securities | $ $ 0 $ 29 $ 1,468 $ 1,935  
Gross losses on securities available for sale | $     48 $ 24  
Fair value of securities pledged to secure public funds and other purposes | $ $ 279,270   $ 279,270   $ 250,397
U.S Agencies and Government Sponsored Enterprises (GSE)          
Schedule of Available-for-sale Securities [Line Items]          
Securities held 14   14   29
Securities held, less than 12 months category 11   11   25
Securities held, more than 12 months category 3   3   4
State and Political Subdivisions          
Schedule of Available-for-sale Securities [Line Items]          
Securities held         21
Securities held, less than 12 months category         16
Securities held, more than 12 months category 1   1   5
Private Label          
Schedule of Available-for-sale Securities [Line Items]          
Securities held, less than 12 months category 3   3   3