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EMPLOYEE BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 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
 
Nine months ended
 
 
September 30,
 
September 30,
(Dollars in thousands)
 
2018
 
2017
 
2018
 
2017
Service cost
 
$
1,736

 
$
1,238

 
$
4,766

 
$
3,715

Interest cost
 
601

 
589

 
1,792

 
1,767

Expected return on assets
 
(2,450
)
 
(2,481
)
 
(7,360
)
 
(7,443
)
Amortization of prior service cost
 
(104
)
 
(103
)
 
(310
)
 
(310
)
Net actuarial loss
 
556

 
438

 
1,633

 
1,315

     Net periodic benefit cost (income)
 
$
339

 
$
(319
)
 
$
521

 
$
(956
)