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Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Expense
The components of net periodic expense for the Company’s supplemental executive retirement plans for the three and six months ended June 30, 2018 and 2017 were as follows:
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
(Dollars in thousands)
2018
 
2017
 
2018

 
2017

Service cost
$
52

 
$
79

 
$
87

 
$
112

Interest cost
43

 
33

 
71

 
78

Actuarial gain recognized
(15
)
 
(24
)
 
(30
)
 
(43
)
Total
$
80

 
$
88

 
$
128

 
$
147