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Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2015
Pension plan  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [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)
 
2015
 
2014
Cost components:
 
 
 
 
Service cost-benefits earned during the period
 
$
(133
)
 
$
(180
)
Interest cost on projected benefit obligation
 
(233
)
 
(202
)
Expected return on plan assets
 
308

 
272

Net amortization and deferral
 
(141
)
 
(533
)
Total net periodic pension cost
 
$
(199
)
 
$
(643
)
SERP  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [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)
 
2015
 
2014
Cost components:
 
 
 
 
Service cost-benefits earned during the period
 
$
—

 
$
(160
)
Interest cost on projected benefit obligation
 
(139
)
 
(110
)
Net amortization and deferral
 
(168
)
 
(114
)
Total net periodic pension cost
 
$
(307
)
 
$
(384
)