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BRANCH CLOSURES (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
item
Dec. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
item
BRANCH CLOSURES      
Number of branch offices whose closure is approved by the board of directors     3
Number of branch offices to be closed   7  
Severance costs | $ $ 75 $ 100 $ 75
Deposits of three branch offices to be closed | $     53
Deposits of closed branches | $   132,000  
Impairment costs for the affected properties | $ $ 175 1,052 389
Other costs related to the closing of the branches | $   $ 48 $ 20
Rushville, Indiana      
BRANCH CLOSURES      
Number of branch offices to be closed 1    
Number of branches at specified location 2    
New Castle, Indiana      
BRANCH CLOSURES      
Number of branch offices to be closed 0    
Number of branches at specified location 2    
Crawfordsville, Indiana      
BRANCH CLOSURES      
Number of branch offices to be closed 1    
Number of branches at specified location 2    
Bourbonnais, Illinois      
BRANCH CLOSURES      
Number of branch offices to be closed 1