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RETIREMENT PLANS: (Tables)
12 Months Ended
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs
Net periodic benefit cost and other amounts recognized in other comprehensive income included the following components:
(Dollar amounts in thousands)
 
2019
 
2018
 
2017
Service cost - benefits earned
 
$
1,218

 
$
1,388

 
$
1,432

Interest cost on projected benefit obligation
 
3,465

 
3,194

 
3,621

Expected return on plan assets
 
(3,585
)
 
(3,962
)
 
(3,940
)
Net amortization and deferral
 
1,558

 
1,448

 
1,205

Net periodic pension cost
 
2,656

 
2,068

 
2,318

Net loss (gain) during the period
 
6,362

 
(1,192
)
 
5,366

Amortization of prior service cost
 
(1
)
 
(1
)
 
(1
)
Amortization of unrecognized gain (loss)
 
(1,558
)
 
(1,447
)
 
(1,204
)
Total recognized in other comprehensive (income) loss
 
4,803

 
(2,640
)
 
4,161

Total recognized net periodic pension cost and other comprehensive income
 
$
7,459

 
$
(572
)
 
$
6,479

Schedule of Defined Benefit Plans Disclosures
The information below sets forth the change in projected benefit obligation, reconciliation of plan assets, and the funded status of the Corporation's retirement program. Actuarial present value of benefits is based on service to date and present pay levels.
(Dollar amounts in thousands)
 
2019
 
2018
Change in benefit obligation:
 
 

 
 

Benefit obligation at January 1
 
$
87,796

 
$
98,096

Service cost
 
1,218

 
1,388

Interest cost
 
3,465

 
3,194

Actuarial (gain) loss
 
14,233

 
(10,618
)
Benefits paid
 
(3,921
)
 
(4,264
)
Benefit obligation at December 31
 
102,791

 
87,796

Reconciliation of fair value of plan assets:
 
 

 
 

Fair value of plan assets at January 1
 
64,335

 
71,449

Actual return on plan assets
 
11,456

 
(5,464
)
Employer contributions
 
2,092

 
2,614

Benefits paid
 
(3,921
)
 
(4,264
)
Fair value of plan assets at December 31
 
73,962

 
64,335

Funded status at December 31 (plan assets less benefit obligation)
 
$
(28,829
)
 
$
(23,461
)
Schedule of Assumptions Used
The accumulated benefit obligation for the defined benefit pension plan was $98.4 million and $83.9 million at year-end
2019 and 2018.
Principal assumptions used to determine pension benefit obligation at year end:
 
2019
 
2018
Discount rate
 
3.22
%
 
4.22
%
Rate of increase in compensation levels
 
3.00

 
3.00


Principal assumptions used to determine net periodic pension cost:
 
2019
 
2018
Discount rate
 
4.22
%
 
3.60
%
Rate of increase in compensation levels
 
3.00

 
3.00

Expected long-term rate of return on plan assets
 
6.00

 
6.00

Schedule of Allocation of Plan Assets
The Corporation's pension plan weighted-average asset allocation for the years 2019 and 2018 by asset category are as follows:
 
 
Pension Plan
Target Allocation
 
ESOP
Target Allocation
 
Pension
Percentage of Plan
Assets at December 31,
 
ESOP
Percentage of Plan
Assets at December 31,
ASSET CATEGORY
 
2019
 
2019
 
2019
 
2018
 
2019
 
2018
Equity securities
 
25-75%
 
95-99%
 
63
%
 
65
%
 
98
%
 
99
%
Debt securities
 
0-50%
 
0-0%
 
33
%
 
31
%
 
%
 
%
Other
 
0-20%
 
0-5%
 
4
%
 
4
%
 
2
%
 
1
%
TOTAL
 
 
 
 
 
100
%
 
100
%
 
100
%
 
100
%
Schedule Of Fair Value Of Plan Assets
The fair value of the plan assets at December 31, 2019 and 2018, by asset category, is as follows:
 
 
 
 
Fair Value Measurements at
December 31, 2019 Using:
 
 
 
 
Quoted Prices
in Active
Markets for
Identical Assets
 
Significant
Other
Observable
Inputs
 
Significant
Observable
Inputs
(Dollar amounts in thousands)
 
Total
 
(Level 1)
 
(Level 2)
 
(Level 3)
Plan assets
 
 

 
 

 
 

 
 

Equity securities
 
$
51,334

 
$
51,334

 
$

 
$

Debt securities
 
13,104

 

 
13,104

 

Investment Funds
 
9,524

 
9,524

 

 

Total plan assets
 
$
73,962

 
$
60,858

 
$
13,104

 
$

 
 
 
 
Fair Value Measurements at
December 31, 2018 Using:
 
 
 
 
Quoted Prices
in Active
Markets for
Identical Assets
 
Significant
Other
Observable
Inputs
 
Significant
Observable
Inputs
(Dollar amounts in thousands)
 
Total
 
(Level 1)
 
(Level 2)
 
(Level 3)
Plan assets
 
 

 
 

 
 

 
 

Equity securities
 
$
43,931

 
$
43,931

 
$

 
$

Debt securities
 
10,652

 

 
10,652

 

Investment Funds
 
9,752

 
9,752

 

 

Total plan assets
 
$
64,335

 
$
53,683

 
$
10,652

 
$

Schedule of Expected Benefit Payments
Estimated Future Payments — The following benefit payments, which reflect expected future service, are expected:
(Dollar amounts in thousands)
2020
$
251

2021
245

2022
246

2023
248

2024
251

2025-2029
1,187

Estimated Future Payments — The following benefit payments, which reflect expected future service, are expected:
PENSION BENEFITS
(Dollar amounts in thousands)
2020
$
4,709

2021
4,987

2022
5,213

2023
5,409

2024
5,567

2025-2029
29,531

Schedule Of Weighted Average Assumptions
Weighted average assumptions at December 31:
 
 
December 31,
 
 
2019
 
2018
Discount rate
 
3.22
%
 
4.22
%
Initial weighted health care cost trend rate
 
5.00
%
 
5.00
%
Ultimate health care cost trend rate
 
5.00

 
5.00

Year that the rate is assumed to stabilize and remain unchanged
 
2020

 
2019

Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates
A one-percentage-point change in the assumed health care cost trend rates would have the following effects:
 
 
1% Point
 
1% Point
(Dollar amounts in thousands)
 
Increase
 
Decrease
Effect on total of service and interest cost components
 
$
1

 
$
1

Effect on post-retirement benefit obligation
 
17

 
16

Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Amounts Recognized in Other Comprehensive Income (Loss)
Amounts recognized in accumulated other comprehensive income at December 31, 2019 and 2018 consist of:
(Dollar amounts in thousands)
 
2019
 
2018
Net loss (gain)
 
$
27,786

 
$
22,982

Prior service cost (credit)
 
2

 
2

 
 
$
27,788

 
$
22,984

Postretirement Health Coverage [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Defined Benefit Plans Disclosures
The Corporation uses a measurement date of December 31. Accrued post-retirement benefits as of December 31, 2019 and 2018 are as follows:
 
 
December 31,
(Dollar amounts in thousands)
 
2019
 
2018
Change in benefit obligation:
 
 

 
 

Benefit obligation at January 1
 
$
3,420

 
$
4,361

Service cost
 
34

 
42

Interest cost
 
145

 
131

Plan participants' contributions
 
65

 
83

Actuarial (gain) loss
 
626

 
(872
)
Benefits paid
 
(315
)
 
(325
)
Benefit obligation at December 31
 
$
3,975

 
$
3,420

Funded status at December 31
 
$
3,975

 
$
3,420

Post-retirement health benefit expense included the following components:
 
 
Years Ended December 31,
(Dollar amounts in thousands)
 
2019
 
2018
 
2017
Service cost
 
$
34

 
$
42

 
$
53

Interest cost
 
146

 
131

 
172

Amortization of net actuarial loss (gain)
 
(16
)
 

 

Net periodic benefit cost
 
164

 
173

 
225

Net loss (gain) during the period
 
626

 
(872
)
 
83

Amortization of prior service cost
 
16

 

 

Total recognized in other comprehensive income (loss)
 
642

 
(872
)
 
83

Total recognized net periodic benefit cost and other comprehensive income
 
$
806

 
$
(699
)
 
$
308

Supplemental Employee Retirement Plans, Defined Benefit  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs
The amounts recognized in other comprehensive income in the current year are as follows:
 
(Dollar amounts in thousands)
 
2019
 
2018
 
2017
Net loss (gain) during the period
 
$
1,357

 
$
260

 
$
527

Amortization of prior service cost
 

 

 

Amortization of unrecognized gain (loss)
 
(75
)
 
(51
)
 

Total recognized in other comprehensive (income) loss
 
$
1,282

 
$
209

 
$
527

Schedule of Expected Benefit Payments
Estimated Future Payments — The following benefit payments, which reflect expected future service, are expected:
(Dollar amounts on thousands)
2020
$

2021
203

2022
399

2023
390

2024
380

2025-2029
3,104