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Pension and Other Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2018
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)
 
2018
 
2017
 
2018
 
2017
Defined Benefit Pension Plans
 
 
 
 
 
 
 
 
Service cost(1)
 
$
—

 
$
234

 
$
—

 
$
467

Interest cost
 
1,092

 
1,301

 
2,184

 
2,603

Expected return on plan assets
 
(2,220
)
 
(2,217
)
 
(4,439
)
 
(4,434
)
Amortization of unrecognized net loss
 
178

 
579

 
355

 
1,157

Net periodic benefit cost (income)(2)
 
$
(950
)
 
$
(103
)
 
$
(1,900
)
 
$
(207
)
Postretirement Benefit Plan
 
 
 
 
 
 
 
 
Service cost(1)
 
$
1

 
$
1

 
$
1

 
$
2

Interest cost
 
20

 
23

 
41

 
47

Amortization of unrecognized net gain
 
(36
)
 
(40
)
 
(71
)
 
(81
)
Net periodic benefit cost (income)(2)
 
$
(15
)
 
$
(16
)
 
$
(29
)
 
$
(32
)

(1) 
Service cost is included in "Salaries, wages and employee benefits expense" on the Consolidated Statements of Income.
(2) 
Net periodic benefit cost (income), excluding service cost is included "Other" operating expenses on the Consolidated Statements of Income.