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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Retirement Benefits [Abstract]  
Components of net periodic benefit cost (income) for the Corporation's qualified and nonqualified pension plans and nonqualified postretirement benefits plan
The components of net periodic benefit cost for the Corporation’s qualified and nonqualified pension plans and nonqualified postretirement benefit plan are as follows:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
(Dollars in thousands)
 
2017
 
2016
 
2017
 
2016
Defined Benefit Pension Plans
 
 
 
 
 
 
 
 
Service cost
 
$
234

 
$
277

 
$
467

 
$
554

Interest cost
 
1,301

 
1,358

 
2,603

 
2,716

Expected return on plan assets
 
(2,217
)
 
(2,140
)
 
(4,434
)
 
(4,281
)
Amortization of unrecognized net loss
 
579

 
572

 
1,157

 
1,144

Net periodic benefit cost (income)
 
$
(103
)
 
$
67

 
$
(207
)
 
$
133

Postretirement Benefit Plan
 
 
 
 
 
 
 
 
Service cost
 
$
1

 
$
2

 
$
2

 
$
4

Interest cost
 
23

 
33

 
47

 
66

Amortization of prior service cost
 
—

 
29

 
—

 
58

Amortization of unrecognized net gain
 
(40
)
 
(25
)
 
(81
)
 
(49
)
Net periodic benefit cost (income)
 
$
(16
)
 
$
39

 
$
(32
)
 
$
79