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EMPLOYEE BENEFIT PLANS (Tables)
 9 Months Ended
Sep. 30, 2017
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)
 
2017
 
2016
 
2017
 
2016
Service cost
 
$
1,238

 
$
1,308

 
$
3,715

 
$
3,925

Interest cost
 
589

 
581

 
1,767

 
1,743

Expected return on assets
 
(2,481
)
 
(2,431
)
 
(7,443
)
 
(7,294
)
Amortization of prior service cost
 
(103
)
 
(103
)
 
(310
)
 
(310
)
Net actuarial loss
 
438

 
420

 
1,315

 
1,261

     Net periodic benefit (income) cost
 
$
(319
)
 
$
(225
)
 
$
(956
)
 
$
(675
)