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JUNIOR SUBORDINATED DEBT (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2005
Dec. 31, 2016
Dec. 31, 2008
Dec. 31, 2007
Junior subordinated notes                  
Junior subordinate debt   $ 6,726   $ 6,726     $ 6,726    
Crosby Statutory Trust I                  
Junior subordinated notes                  
Proceeds of trust preferred securities           $ 5,000      
Junior subordinate debt               $ 5,155  
Interest expense   35 $ 28 101 $ 82        
Investment in common securities of the trust   155   155     155    
County Bancshares Trust I                  
Junior subordinated notes                  
Proceeds of trust preferred securities           $ 5,500      
Junior subordinate debt                 $ 5,671
Purchase of trust preferred securities $ 4,100                
Trust preferred securities   1,571   $ 1,571          
Interest rate (as a percent)       3.30%          
Interest expense   48 $ 39 $ 135 $ 112        
County Bancshares Trust I | Other Assets                  
Junior subordinated notes                  
Investment in common securities of the trust   $ 171   $ 171     $ 171    
LIBOR | Crosby Statutory Trust I                  
Junior subordinated notes                  
Variable interest rate spread (as a percent)       1.44%          
Interest rate (as a percent)       2.76%          
LIBOR | County Bancshares Trust I                  
Junior subordinated notes                  
Variable interest rate spread (as a percent)       2.00%