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Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Components of net periodic pension cost
The pension and retirement expense for the SERP was as follows:
 
Six Months Ended June 30,
($ in thousands)
2018
 
2017
Cost components:
 
 
 
Interest cost on projected benefit obligation
$
(128
)
 
$
(146
)
Net amortization and deferral
(32
)
 
(166
)
Total net periodic pension cost
$
(160
)
 
$
(312
)
The expected total pension and retirement expense for the Benefit Plan was as follows:
 
Six Months Ended June 30,
($ in thousands)
2018
 
2017
Cost components:
 
 
 
Service cost-benefits earned during the period
$
—

 
$
(45
)
Interest cost on projected benefit obligation
(182
)
 
(198
)
Expected return on plan assets
292

 
263

Net amortization and deferral
(32
)
 
(73
)
Total net periodic pension earnings (cost)
$
78

 
$
(53
)