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PENSION AND POSTRETIREMENT PLANS (Tables)
6 Months Ended
Jun. 30, 2018
EMPLOYEE BENEFITS  
Schedule of components of net periodic benefit (credit) cost
    Three Months Ended June 30,     Six Months Ended June 30,  
      Pension Benefits       SERP Benefits       Pension Benefits       SERP Benefits  
(In thousands)     2018       2017       2018       2017       2018       2017       2018       2017  
Service cost   $ 325     $ 292     $ 72     $ 52     $ 650     $ 585     $ 145     $ 105  
Interest cost     198       186       31       26       395       370       63       52  
Expected return on plan assets     (625 )     (520 )     -       -       (1,250 )     (1,040 )     -       -  
Amortization of net loss     82       112       31       13       165       225       61       26  
Amortization of prior service credit     (19 )     (19 )     -       -       (38 )     (38 )     -       -  
Amortization of transition obligation     -       -       1       7       -       -       2       14  
Net periodic benefit (credit) cost   $ (39 )   $ 51     $ 135     $ 98     $ (78 )   $ 102     $ 271     $ 197