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Defined Benefit Pension Plans (Tables)
3 Months Ended
Mar. 31, 2013
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Components of Net Periodic Benefit Cost

The composition of net periodic benefit cost was as follows for the periods indicated:
(Dollars in thousands)
Qualified Pension Plan
 
Non-Qualified Retirement Plans
Three months ended March 31,
 
2013
 
2012
 
2013
 
2012
Service cost
 

$730

 

$644

 

$50

 

$38

Interest cost
 
719

 
706

 
115

 
126

Expected return on plan assets
 
(925
)
 
(746
)
 

 

Amortization of prior service cost
 
(8
)
 
(8
)
 

 

Recognized net actuarial loss
 
414

 
244

 
49

 
29

Net periodic benefit cost
 

$930

 

$840

 

$214

 

$193