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Defined Benefit Pension Plans
 9 Months Ended
Sep. 30, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Defined Benefit Pension Plans
Defined Benefit Pension Plans
The Corporation maintains a tax-qualified defined benefit pension plan for the benefit of certain eligible employees who were hired prior to October 1, 2007. The Corporation also has non-qualified retirement plans to provide supplemental retirement benefits to certain employees, as defined in the plans. In September 2013, the Corporation amended its defined benefit pension plans primarily to freeze benefit accruals after a ten-year transition period ending in December 2023.

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,
2014
 
2013
 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Service cost

$538

 

$710

 

$1,614

 

$2,171

 

$11

 

$48

 

$34

 

$147

Interest cost
723

 
722

 
2,168

 
2,160

 
119

 
116

 
358

 
346

Expected return on plan assets
(1,016
)
 
(931
)
 
(3,047
)
 
(2,780
)
 
—

 
—

 
—

 
—

Amortization of prior service cost
(6
)
 
17

 
(17
)
 
—

 
—

 
—

 
—

 
—

Recognized net actuarial loss
115

 
354

 
345

 
1,182

 
18

 
47

 
53

 
145

Curtailment
—

 
(61
)
 
—

 
(61
)
 
—

 
(2
)
 
—

 
(2
)
Net periodic benefit cost

$354

 

$811

 

$1,063

 

$2,672

 

$148

 

$209

 

$445

 

$636



The pension plan is funded on a current basis, in compliance with the requirements of ERISA.