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Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 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:
 
 
Three Months Ended
March 31
($ in thousands)
 
2015
 
2014
Cost components:
 
 
 
 
Service cost-benefits earned during the period
 
$
(66
)
 
$
(90
)
Interest cost on projected benefit obligation
 
(117
)
 
(101
)
Expected return on plan assets
 
154

 
136

Net amortization and deferral
 
(70
)
 
(470
)
Total net periodic pension cost
 
$
(99
)
 
$
(525
)
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:
 
 
Three Months Ended
March 31
($ in thousands)
 
2015
 
2014
Cost components:
 
 
 
 
Service cost-benefits earned during the period
 
$
—

 
$
(80
)
Interest cost on projected benefit obligation
 
(69
)
 
(55
)
Net amortization and deferral
 
(84
)
 
(57
)
Total net periodic pension cost
 
$
(153
)
 
$
(192
)