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Defined Benefit Pension Plans (Tables)
 9 Months Ended
Sep. 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
 
Nine months
 
Three months
 
Nine months
Periods ended September 30,
2013
 
2012
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Service cost

$710

 

$644

 

$2,171

 

$1,931

 

$48

 

$38

 

$147

 

$113

Interest cost
722

 
705

 
2,160

 
2,117

 
116

 
126

 
346

 
378

Expected return on plan assets
(931
)
 
(746
)
 
(2,780
)
 
(2,239
)
 
—

 
—

 
—

 
—

Amortization of prior service cost
17

 
(8
)
 
—

 
(25
)
 
—

 
(1
)
 
—

 
(1
)
Recognized net actuarial loss
354

 
246

 
1,182

 
737

 
47

 
29

 
145

 
88

Curtailment
(61
)
 
—

 
(61
)
 
—

 
(2
)
 
—

 
(2
)
 
—

Net periodic benefit cost

$811

 

$841

 

$2,672

 

$2,521

 

$209

 

$192

 

$636

 

$578