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Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Periodic Benefit Cost Not yet Recognized
The components of net periodic expense for the Company’s supplemental executive retirement plans for the three and six months ended June 30, 2016 and 2015 were as follows:

(Dollars in thousands)
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
 
2016

 
2015

 
2016

 
2015

Service cost
 
$
56

 
$
91

 
104

 
165

Interest cost
 
47

 
78

 
85

 
124

Actuarial gain recognized
 
(46
)
 
(110
)
 
(72
)
 
(155
)
 
 
$
57

 
$
59

 
$
117

 
$
134