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Defined Benefit Pension Plans (Tables)
6 Months Ended
Jun. 30, 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
 
Six months
 
Three months
 
Six months
Periods ended June 30,
2013
 
2012
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Service cost

$731

 

$643

 

$1,461

 

$1,287

 

$49

 

$37

 

$99

 

$75

Interest cost
719

 
706

 
1,438

 
1,412

 
115

 
126

 
230

 
252

Expected return on plan assets
(924
)
 
(747
)
 
(1,849
)
 
(1,493
)
 

 

 

 

Amortization of prior service cost
(9
)
 
(9
)
 
(17
)
 
(17
)
 

 

 

 

Recognized net actuarial loss
414

 
247

 
828

 
491

 
49

 
30

 
98

 
59

Net periodic benefit cost

$931

 

$840

 

$1,861

 

$1,680

 

$213

 

$193

 

$427

 

$386