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RETIREMENT AND POSTRETIREMENT PLANS (Tables)
 3 Months Ended
Mar. 31, 2018
RETIREMENT AND POSTRETIREMENT PLANS [Abstract]  
Components of Net Periodic Costs
Net expenses associated with these plans were comprised of the following components:

  
Three Months Ended March 31,
 
  
2018
  
2017
 
  
BMP, Employee and
Outside Director
Retirement Plans
  
Postretirement
Plan
  
BMP, Employee and
Outside Director
Retirement Plans
  
Postretirement
Plan
 
             
Service cost
 
$
-
  
$
-
  
$
-
  
$
-
 
Interest cost
  
292
   
14
   
329
   
14
 
Expected return on assets
  
(430
)
  
-
   
(395
)
  
-
 
Unrecognized past service liability
  
-
   
(2
)
  
-
   
(2
)
Amortization of unrealized loss (gain)
  
289
   
-
   
359
   
(1
)
Net periodic cost
 
$
151
  
$
12
  
$
293
  
$
11