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EMPLOYEE BENEFIT PLANS (Tables)
 6 Months Ended
Jun. 30, 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
 
Six months ended
 
 
June 30,
 
June 30,
(Dollars in thousands)
 
2018
 
2017
 
2018
 
2017
Service cost
 
$
1,735

 
$
1,239

 
$
3,030

 
$
2,477

Interest cost
 
601

 
589

 
1,191

 
1,178

Expected return on assets
 
(2,450
)
 
(2,481
)
 
(4,910
)
 
(4,962
)
Amortization of prior service cost
 
(103
)
 
(104
)
 
(206
)
 
(207
)
Net actuarial loss
 
555

 
439

 
1,077

 
877

     Net periodic benefit cost (income)
 
$
338

 
$
(318
)
 
$
182

 
$
(637
)