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Associate Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Periodic Benefit Cost Components of Postretirement Benefits
The following disclosures relating to postretirement medical benefits were measured at December 31:
 
(Dollars in thousands)
2018
 
2017
 
2016
Change in benefit obligation:
 
 
 
 
 
Benefit obligation at beginning of year
$
1,990

 
$
1,764

 
$
1,805

Service cost
60

 
53

 
58

Interest cost
70

 
71

 
76

Actuarial gain
(143
)
 
207

 
(68
)
Benefits paid
(84
)
 
(105
)
 
(107
)
Benefit obligation at end of year
$
1,893

 
$
1,990

 
$
1,764

Change in plan assets:
 
 
 
 
 
Fair value of plan assets at beginning of year
$
—

 
$
—

 
$
—

Employer contributions
84

 
105

 
107

Benefits paid
(84
)
 
(105
)
 
(107
)
Fair value of plan assets at end of year
$
—

 
$
—

 
$
—

Funded status:
 
 
 
 
 
Unfunded status
$
(1,893
)
 
$
(1,990
)
 
$
(1,764
)
Total (income) recognized in other comprehensive income
(1,370
)
 
(1,348
)
 
(1,701
)
Net amount recognized
$
(3,263
)
 
$
(3,338
)
 
$
(3,465
)
Components of net periodic benefit cost:
 
 
 
 
 
Service cost
$
60

 
$
53

 
$
58

Interest cost
70

 
71

 
76

Amortization of transition obligation
(76
)
 
(76
)
 
(76
)
Net (gain) loss recognition
(45
)
 
(70
)
 
505

Net periodic benefit cost
$
9

 
$
(22
)
 
$
563

Assumption used to determine net periodic benefit cost:
 
 
 
 
 
Discount rate
3.60
%
 
4.10
%
 
4.25
%
Assumption used to value the Accumulated Postretirement Benefit Obligation (APBO):
 
 
 
 
 
Discount rate
4.20
%
 
3.60
%
 
4.10
%
Estimated Future Benefit Payments
The following table shows the expected future payments for the next 10 years:
(Dollars in thousands)
 
During 2018
$
68

During 2019
69

During 2020
69

During 2021
72

During 2022
76

During 2023 through 2027
463

 
$
817
Pennsylvania | Alliance  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Net Periodic Benefit Cost Components of Postretirement Benefits
The following disclosures relating to Alliance pension benefits were measured at December 31:
 
(Dollars in thousands)
2018
 
2017
 
2016
Change in benefit obligation:
 
 
 
 
 
Benefit obligation at beginning of year
$
7,853

 
$
7,517

 
$
7,148

Interest cost
279

 
297

 
301

Settlements
(1,142
)
 
—

 
—

Disbursements
(271
)
 
(407
)
 
(374
)
Actuarial loss
(430
)
 
446

 
442

Benefit obligation at end of year
$
6,289

 
$
7,853

 
$
7,517

Change in plan assets:
 
 
 
 
 
Fair value of plan assets at beginning of year
$
8,378

 
$
7,504

 
$
7,397

Actual return on Plan Assets
(393
)
 
1,314

 
518

Settlements
(1,146
)
 
—

 
—

Benefits paid
(271
)
 
(407
)
 
(374
)
Administrative Expenses
(35
)
 
(33
)
 
(37
)
Fair value of plan assets at end of year
$
6,533

 
$
8,378

 
$
7,504

Funded status:
 
 
 
 
 
Unfunded status
$
(6,289
)
 
$
(7,853
)
 
$
(7,517
)
Total loss (income) recognized in other comprehensive income
6,533

 
8,378

 
7,504

Net amount recognized
$
244

 
$
525

 
$
(13
)
Components of net periodic benefit cost:
 
 
 
 
 
Service cost
$
40

 
$
40

 
$
40

Interest cost
279

 
297

 
301

Expected return on plan assets
(596
)
 
(548
)
 
(541
)
Settlements
(24
)
 
—

 
—

Net gain recognition
413

 
(170
)
 
(157
)
Net periodic benefit cost
$
112

 
$
(381
)
 
$
(357
)
Assumptions used to value the Accumulated Postretirement Benefit Obligation (APBO):
 
 
 
 
 
Discount rate for Net Periodic Benefit Cost
3.60
%
 
4.00
%
 
4.00
%
Expected Return on Plan Assets
7.50
%
 
7.50
%
 
7.50
%
Discount rate for Disclosure Obligations
4.20
%
 
3.60
%
 
4.00
%
Estimated Future Benefit Payments
The following table shows the expected future payments for the next 10 years:

(Dollars in thousands)
 
During 2019
$
312

During 2020
310

During 2021
432

During 2022
318

During 2023
322

During 2024 through 2028
2,810

 
$
4,504