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Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2019
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)
 
2019
 
2018
 
2019
 
2018
Defined Benefit Pension Plans
 
 
 
 
 
 
 
 
Interest cost
 
$
1,172

 
$
1,092

 
$
2,345

 
$
2,184

Expected return on plan assets
 
(2,190
)
 
(2,220
)
 
(4,381
)
 
(4,439
)
Amortization of unrecognized net loss
 
141

 
178

 
281

 
355

Net periodic benefit cost (income)(1)
 
$
(877
)
 
$
(950
)
 
$
(1,755
)
 
$
(1,900
)
Postretirement Benefit Plan
 
 
 
 
 
 
 
 
Service cost(2)
 
$
—

 
$
1

 
$
1

 
$
1

Interest cost
 
21

 
20

 
43

 
41

Amortization of unrecognized net gain
 
(45
)
 
(36
)
 
(90
)
 
(71
)
Net periodic benefit cost (income)(1)
 
$
(24
)
 
$
(15
)
 
$
(46
)
 
$
(29
)

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