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Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2016
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)
 
2016
 
2015
Cost components:
 
 
 
 
Service cost-benefits earned during the period
 
$
(111
)
 
$
(133
)
Interest cost on projected benefit obligation
 
(203
)
 
(233
)
Expected return on plan assets
 
258

 
308

Net amortization and deferral
 
(92
)
 
(141
)
Total net periodic pension cost
 
$
(148
)
 
$
(199
)
SERP  
Defined Benefit Plan Disclosure [Line Items]  
Components of net periodic pension cost
The pension and retirement expense for the SERP was as follows:
 
 
Six Months Ended June 30,
($ in thousands)
 
2016
 
2015
Cost components:
 
 
 
 
Interest cost on projected benefit obligation
 
(161
)
 
(139
)
Net amortization and deferral
 
(172
)
 
(168
)
Total net periodic pension cost
 
$
(333
)
 
$
(307
)