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EMPLOYEE BENEFIT PLANS (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Employee Benefit Plan Amounts Recognized in the Consolidated Balance Sheets and Consolidated Statements of Income The following table sets forth information concerning amounts recognized in First Financial’s Consolidated Statements of Income related to the Company's pension plan:
 
 
Three months ended
 
 
March 31,
(Dollars in thousands)
 
2018
 
2017
Service cost
 
$
1,295

 
$
1,238

Interest cost
 
590

 
589

Expected return on assets
 
(2,460
)
 
(2,481
)
Amortization of prior service cost
 
(103
)
 
(103
)
Net actuarial loss
 
522

 
438

     Net periodic benefit (income) cost
 
$
(156
)
 
$
(319
)