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Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Pension plan  
Defined Benefit Plan Disclosure [Line Items]  
Components of net periodic pension cost
The expected total pension and retirement expense for the Benefit Plan was as follows:
 
Six Months Ended June 30,
($ in thousands)
2017
 
2016
Cost components:
 
 
 
Service cost-benefits earned during the period
$
(45
)
 
$
(111
)
Interest cost on projected benefit obligation
(198
)
 
(203
)
Expected return on plan assets
263

 
258

Net amortization and deferral
(73
)
 
(92
)
Total net periodic pension cost
$
(53
)
 
$
(148
)
SERP  
Defined Benefit Plan Disclosure [Line Items]  
Components of net periodic pension cost
he pension and retirement expense for the SERP was as follows:
 
Six Months Ended June 30,
($ in thousands)
2017
 
2016
Cost components:
 
 
 
Interest cost on projected benefit obligation
$
(146
)
 
$
(161
)
Net amortization and deferral
(166
)
 
(172
)
Total net periodic pension cost
$
(312
)
 
$
(333
)