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EMPLOYEE BENEFIT PLANS (Tables)
 3 Months Ended
Mar. 31, 2019
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)
 
2019
 
2018
Service cost
 
$
1,750

 
$
1,295

Interest cost
 
700

 
590

Expected return on assets
 
(2,450
)
 
(2,460
)
Amortization of prior service cost
 
(100
)
 
(103
)
Net actuarial loss
 
475

 
522

     Net periodic benefit cost (income)
 
$
375

 
$
(156
)