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Defined Benefit Pension Plans (Tables)
 6 Months Ended
Jun. 30, 2014
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,
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Service cost

$538

 

$731

 

$1,076

 

$1,461

 

$11

 

$49

 

$23

 

$99

Interest cost
722

 
719

 
1,445

 
1,438

 
119

 
115

 
239

 
230

Expected return on plan assets
(1,015
)
 
(924
)
 
(2,031
)
 
(1,849
)
 
—

 
—

 
—

 
—

Amortization of prior service cost
(5
)
 
(9
)
 
(11
)
 
(17
)
 
—

 
—

 
—

 
—

Recognized net actuarial loss
115

 
414

 
230

 
828

 
19

 
49

 
35

 
98

Net periodic benefit cost

$355

 

$931

 

$709

 

$1,861

 

$149

 

$213

 

$297

 

$427