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RETIREMENT PLANS: (Tables)
 12 Months Ended
Dec. 31, 2021
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)202120202019
Service cost - benefits earned$1,355 $1,300 $1,218 
Interest cost on projected benefit obligation2,632 3,116 3,465 
Expected return on plan assets(4,713)(4,198)(3,585)
Net amortization and deferral2,072 1,968 1,558 
Net periodic pension cost1,346 2,186 2,656 
Net loss (gain) during the period(5,883)3,188 6,362 
Amortization of prior service cost(1)(1)(1)
Amortization of unrecognized gain (loss)(2,072)(1,967)(1,558)
Total recognized in other comprehensive (income) loss(7,956)1,220 4,803 
Total recognized net periodic pension cost and other comprehensive income$(6,610)$3,406 $7,459 
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)20212020
Change in benefit obligation:  
Benefit obligation at January 1$109,922 $102,791 
Service cost1,355 1,300 
Interest cost2,632 3,116 
Actuarial (gain) loss(2,943)6,845 
Benefits paid(4,470)(4,130)
Benefit obligation at December 31106,496 109,922 
Reconciliation of fair value of plan assets:  
Fair value of plan assets at January 182,437 73,962 
Actual return on plan assets7,654 7,856 
Employer contributions2,358 4,749 
Benefits paid(4,470)(4,130)
Fair value of plan assets at December 3187,979 82,437 
Funded status at December 31 (plan assets less benefit obligation)$(18,517)$(27,485)
Schedule of Assumptions Used
The accumulated benefit obligation for the defined benefit pension plan was $102.4 million and $105.2 million at year-end
2021 and 2020.

Principal assumptions used to determine pension benefit obligation at year end:20212020
Discount rate2.83 %2.52 %
Rate of increase in compensation levels3.00 3.00 
Principal assumptions used to determine net periodic pension cost:20212020
Discount rate2.52 %3.22 %
Rate of increase in compensation levels3.00 3.00 
Expected long-term rate of return on plan assets6.00 6.00 
Schedule of Allocation of Plan Assets The Corporation's pension plan weighted-average asset allocation for the years 2021 and 2020 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 CATEGORY202120212021202020212020
Equity securities
25-75%
95-99%
63 %63 %98 %99 %
Debt securities
0-50%
0-0%
32 %31 %— %— %
Other
0-20%
0-5%
5 %6 %2 %1 %
TOTAL  100 %100 %100 %100 %
Schedule Of Fair Value Of Plan Assets The fair value of the plan assets at December 31, 2021 and 2020, by asset category, is as follows:
Fair Value Measurements at
December 31, 2021 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$62,382 $62,382 $— $— 
Debt securities10,102 — 10,102 — 
Investment Funds15,495 15,495 — — 
Total plan assets$87,979 $77,877 $10,102 $— 
Fair Value Measurements at
December 31, 2020 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$55,235 $55,235 $— $— 
Debt securities12,673 — 12,673 — 
Investment Funds14,529 14,529 — — 
Total plan assets$82,437 $69,764 $12,673 $— 
Schedule of Expected Benefit Payments
Estimated Future Payments — The following benefit payments, which reflect expected future service, are expected:
PENSION BENEFITS
(Dollar amounts in thousands)
2022$5,889 
20236,107 
20246,293 
20256,430 
20266,663 
2027-203134,497 
Estimated Future Payments — The following benefit payments, which reflect expected future service, are expected:
(Dollar amounts in thousands)
2022$248 
2023253 
2024258 
2025253 
2026250 
2027-20311,242 
Schedule Of Weighted Average Assumptions
Weighted average assumptions at December 31:
 December 31,
 20212020
Discount rate2.83 %2.52 %
Initial weighted health care cost trend rate5.00 %5.00 %
Ultimate health care cost trend rate5.00 5.00 
Year that the rate is assumed to stabilize and remain unchanged20222021
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, 2021 and 2020 consist of:
(Dollar amounts in thousands)20212020
Net loss (gain)$21,051 $29,006 
Prior service cost (credit)— 1 
 $21,051 $29,007 
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, 2021 and 2020 are as follows:
 December 31,
(Dollar amounts in thousands)20212020
Change in benefit obligation:  
Benefit obligation at January 1$4,147 $3,975 
Service cost43 38 
Interest cost103 125 
Plan participants' contributions34 75 
Actuarial (gain) loss(53)238 
Benefits paid(259)(304)
Benefit obligation at December 31$4,015 $4,147 
Funded status at December 31$4,015 $4,147 
Post-retirement health benefit expense included the following components:
 Years Ended December 31,
(Dollar amounts in thousands)202120202019
Service cost$43 $38 $34 
Interest cost103 125 146 
Amortization of net actuarial loss (gain)— — (16)
Net periodic benefit cost146 163 164 
Net loss (gain) during the period(53)238 626 
Amortization of prior service cost— — 16 
Total recognized in other comprehensive income (loss)(53)238 642 
Total recognized net periodic benefit cost and other comprehensive income$93 $401 $806 
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)202120202019
Net loss (gain) during the period$54 $1,459 $1,357 
Amortization of prior service cost— — — 
Amortization of unrecognized (gain) loss(441)(246)(75)
Total recognized in other comprehensive (income) loss$(387)$1,213 $1,282 
Schedule of Expected Benefit Payments
Estimated Future Payments — The following benefit payments, which reflect expected future service, are expected:
(Dollar amounts on thousands)
2022$— 
2023203 
2024399 
2025390 
2026380 
2027-20313,104