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Retirement Plans (Tables)
12 Months Ended
Dec. 31, 2019
Retirement Benefits [Abstract]  
Schedule of Benefit Obligation
The benefit obligation at December 31, 2019 and December 31, 2018 was calculated as follows:
 
2019
 
2018
 
(Dollars in thousands)
Benefit obligation, January 1
$
5,521

 
$
4,901

Service cost
226

 
417

Interest cost
289

 
268

Benefits paid
(87
)
 
(65
)
Accrued liability at December 31
$
5,949

 
$
5,521

Schedule of Net Periodic Pension Cost
The net periodic SERP pension cost for 2019 and 2018 was calculated as follows:
 
2019
 
2018
 
(Dollars in thousands)
Service cost
$
226

 
$
417

Interest cost
289

 
268

 
$
515

 
$
685