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SECURITIES AVAILABLE FOR SALE - Additional Information (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
security
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
security
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
security
Schedule of Available-for-sale Securities [Line Items]          
Securities held 24   24   37
Gross gains on the sales of securities | $ $ 29 $ 515 $ 1,935 $ 2,034  
Gross losses on securities available for sale | $ 0 $ 46 24 $ 366  
Fair value of securities pledged to secure public funds and other purposes | $ $ 257,835   $ 257,835   $ 261,034
Mortgage-backed Securities Issued by U.S. Treasuries and Government Sponsored Enterprises (GSE)          
Schedule of Available-for-sale Securities [Line Items]          
Securities held 11   11   21
Securities held, less than 12 months category 7   7   13
Securities held, more than 12 months category         8
States and political subdivisions          
Schedule of Available-for-sale Securities [Line Items]          
Securities held 13   13    
Securities held, less than 12 months category 8   8    
Securities held, more than 12 months category         16