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GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Goodwill [Roll Forward]          
Beginning of year     $ 21,824 $ 21,824 $ 21,824
Acquired goodwill     0 0  
Ending balance $ 21,824 $ 21,824 21,824 21,824 21,824
Finite-lived intangible assets, net [Abstract]          
Balance Acquired     11,608   11,608
Accumulated Amortization 9,316   9,316   8,663
Aggregate amortization expense 214 $ 245 653 $ 748  
Finite-lived intangible assets, future amortization expense [Abstract]          
2017 207   207    
2018 734   734    
2019 609   609    
2020 484   484    
2021 258   258    
Total 2,292   2,292    
Core deposit intangibles          
Finite-lived intangible assets, net [Abstract]          
Balance Acquired     5,975   5,975
Accumulated Amortization 5,077   5,077   4,689
Other customer relationship intangibles          
Finite-lived intangible assets, net [Abstract]          
Balance Acquired     5,633   5,633
Accumulated Amortization $ 4,239   $ 4,239   $ 3,974