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Defined Benefit Pension Plans
 3 Months Ended
Mar. 31, 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.  The supplemental retirement plans provide eligible participants with an additional retirement benefit. 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 ended March 31,
 
2014
 
2013
 
 
2014
 
2013
Service cost
 

$538

 

$730

 
 

$12

 

$50

Interest cost
 
723

 
719

 
 
120

 
115

Expected return on plan assets
 
(1,016
)
 
(925
)
 
 
—

 
—

Amortization of prior service cost
 
(6
)
 
(8
)
 
 
—

 
—

Recognized net actuarial loss
 
115

 
414

 
 
16

 
49

Net periodic benefit cost
 

$354

 

$930

 
 

$148

 

$214



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