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Retirement Plans and Other Postretirement Benefits
 6 Months Ended
Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Retirement Plans and Other Postretirement Benefits
Retirement Plans and Other Postretirement Benefits
Substantially all employees who were hired before December 8, 2009 are covered by a noncontributory retirement plan. Employees hired on or after December 8, 2009 are not eligible to participate in the noncontributory retirement plan. The Corporation also provides supplemental executive retirement benefits, a portion of which is in excess of limits imposed on qualified plans by federal tax law. These plans are non-qualified benefit plans. Information on these plans are aggregated and reported under “Retirement Plans” within this footnote.
The Corporation also provides certain postretirement healthcare and life insurance benefits for retired employees. Information on these benefits is reported under “Other Postretirement Benefits” within this footnote.
The Corporation sponsors a Supplemental Non-Qualified Pension Plan which was established in 1981 prior to the existence of a 401(k) deferred salary savings plan, employee stock purchase plan and long-term incentive plans and therefore is not offered to new participants; all current participants are now retired.


Components of net periodic benefit cost (income) were as follows: 
 
Three Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
(Dollars in thousands)
Retirement Plans
 
Other Post Retirement
Benefits
Service cost
$
193

 
$
137

 
$
14

 
$
18

Interest cost
488

 
475

 
27

 
31

Expected return on plan assets
(756
)
 
(745
)
 
—

 
—

Amortization of net actuarial loss
326

 
165

 
14

 
2

Accretion of prior service cost
(70
)
 
(71
)
 
—

 
2

Net periodic benefit cost (income)
$
181

 
$
(39
)
 
$
55

 
$
53

 
Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
(Dollars in thousands)
Retirement Plans
 
Other Post Retirement
Benefits
Service cost
$
386

 
$
273

 
$
29

 
$
37

Interest cost
976

 
950

 
55

 
67

Expected return on plan assets
(1,512
)
 
(1,490
)
 
—

 
—

Amortization of net actuarial loss
654

 
326

 
27

 
5

Accretion of prior service cost
(140
)
 
(141
)
 
—

 
(3
)
Net periodic benefit cost (income)
$
364

 
$
(82
)
 
$
111

 
$
106


The Corporation contributed $2.0 million to its qualified retirement plan during the three and six months ended June 30, 2015. The Corporation previously disclosed in its financial statements for the year ended December 31, 2014, that it expected to make contributions of $166 thousand to its non-qualified retirement plans and $113 thousand to its other postretirement benefit plans in 2015. During the six months ended June 30, 2015, the Corporation contributed $98 thousand to its non-qualified retirement plans and $47 thousand to its other postretirement plans. During the six months ended June 30, 2015, $1.2 million has been paid to participants from the retirement plans and $47 thousand has been paid to participants from the other postretirement plans.