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EMPLOYEE BENEFIT PLANS (Tables)
 12 Months Ended
Dec. 31, 2019
Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]  
Schedule of benefit obligation, fair value of plan assets and the funded status of the Company's defined benefit pension plan and unfunded excess benefit plan
The following table presents the benefit obligation, fair value of plan assets, funded status, and amounts not yet recognized as components of net periodic pension costs for PLC’s defined benefit pension plan and unfunded excess benefit plan as of December 31, 2019 and 2018:
 December 31, 2019December 31, 2018
Qualified Pension PlanNonqualified Excess
Pension Plan		Qualified Pension PlanNonqualified Excess
Pension Plan
 (Dollars In Thousands)
Accumulated benefit obligation, end of year$320,023  $49,446  $269,802  $46,299  
Change in projected benefit obligation:
Projected benefit obligation at beginning of year          $288,129  $47,345  $300,423  $54,590  
Service cost13,277  1,148  13,185  1,415  
Interest cost11,380  1,572  9,830  1,436  
Amendments—  —  —  —  
Actuarial (gain)/loss47,913  4,569  (15,608) (2,001) 
Benefits paid(17,841) (3,967) (19,701) (8,095) 
Projected benefit obligation at end of year342,858  50,667  288,129  47,345  
Change in plan assets:
Fair value of plan assets at beginning of year253,955  —  260,926  —  
Actual return on plan assets51,308  —  (6,070) —  
Employer contributions(1)
17,400  3,967  18,800  8,095  
Benefits paid(17,841) (3,967) (19,701) (8,095) 
Fair value of plan assets at end of year304,822  —  253,955  —  
After reflecting FASB guidance:
Funded status(38,036) (50,667) (34,174) (47,345) 
Amounts recognized in the balance sheet:  
Other liabilities(38,036) (50,667) (34,174) (47,345) 
Amounts recognized in accumulated other comprehensive income:  
Net actuarial (gain)/loss25,082  13,041  10,370  9,025  
Prior service cost/(credit)—  —  —  —  
Total amounts recognized in AOCI$25,082  $13,041  $10,370  $9,025  
(1)Employer contributions are shown based on the calendar year in which contributions were made to each plan.
Schedule of weighted-average assumptions used to determine benefit obligations
Weighted-average assumptions used to determine benefit obligations as of December 31 are as follows:
Qualified Pension PlanNonqualified Excess Pension Plan
2019201820192018
Discount rate3.12 %4.21 %2.76 %3.93 %
Rate of compensation increase
4.75% prior to age 40/ 3.75% for age 40 and above
4.75% prior to age 40/ 3.75% for age 40 and above
4.75% prior to age 40/ 3.75% for age 40 and above
4.75% prior to age 40/ 3.75% for age 40 and above
Schedule of weighted-average assumptions used to determine the net periodic benefit cost
Weighted-average assumptions used to determine the net periodic benefit cost for the years ended December 31, 2019, 2018, and 2017, are as follows:
 Qualified Pension Plan  Nonqualified Excess Pension Plan  
For The Year Ended December 31,  
201920182017201920182017
Discount rate4.21 %3.55 %4.04 %3.94 %3.25 %3.60 %
Rate of compensation increase
4.75% prior to age 40/ 3.75% for age 40 and above
4.75% prior to age 40/ 3.75% for age 40 and above
4.75% prior to age 40/ 3.75% for age 40 and above
4.75% prior to age 40/ 3.75% for age 40 and above
4.75% prior to age 40/ 3.75% for age 40 and above
4.75% prior to age 40/ 3.75% for age 40 and above
Expected long-term return on plan assets7.00 %7.00 %7.00 %N/A  N/A  N/A  
Components of the net periodic benefit cost of PLC's defined benefit pension plan and unfunded excess benefit plan
Components of the net periodic benefit cost for the years ended December 31, 2019, 2018, and 2017 are as follows: 
 Qualified Pension PlanNonqualified Excess Pension Plan
For The Year Ended December 31,
201920182017201920182017
 (Dollars In Thousands)
Service cost — benefits earned during the period$13,277  $13,185  $12,011  $1,148  $1,415  $1,350  
Interest cost on projected benefit obligation11,380  9,830  9,846  1,572  1,436  1,480  
Expected return on plan assets(18,106) (17,058) (13,570) —  —  —  
Amortization of prior service cost—  —  —  —  —  —  
Amortization of actuarial losses(1)
—  —  —  553  969  634  
Preliminary net periodic benefit cost6,551  5,957  8,287  3,273  3,820  3,464  
Settlement/curtailment expense(2)
—  —  —  —  1,526  —  
Total net periodic benefit cost$6,551  $5,957  $8,287  $3,273  $5,346  $3,464  
(1)2019 average remaining service period used is 8.69 years and 7.68 years for the defined benefit pension plan and unfunded excess benefit plan, respectively.
(2)The excess pension plan triggered settlement accounting for the year ended December 31, 2018 since the total lump sum payments exceeded the settlement threshold of service cost plus interest cost.
Schedule of estimated future benefit payments under defined benefit pension plan Estimated future benefit payments under the Qualified Pension Plan and Nonqualified Excess Pension Plan are as follows:
YearsQualified
Pension Plan		Nonqualified Excess
Pension Plan
 (Dollars In Thousands)
2020$22,026  $6,832  
202122,831  5,654  
202225,577  6,005  
202323,965  5,126  
202425,489  4,387  
2025 - 2029129,165  19,648  
Schedule of allocation of plan assets by category
Allocation of plan assets of the Qualified Pension Plan by category as of December 31, are as follows:
Asset CategoryTarget
Allocation 		20182019
Return-Seeking60 %61 %61 %
Liability-Hedging Fixed Income40  39  39  
Total100 %100 %100 %
Schedule of fair value of plan assets by category Plan assets of the Qualified Pension Plan by category as of December 31, 2019 and 2018 are as follows:
As of December 31,
Asset Category20192018
 (Dollars In Thousands)
Cash and cash equivalents$3,713  $1,225  
Equity securities:
Collective Russell 3000 equity index fund100,673  70,599  
Fidelity Spartan 500 index fund31,693  46,300  
Northern Trust ACWI ex-US Fund56,996  41,924  
Liability-hedging fixed income:
  Group Deposit Administration Annuity Contract75,052  78,707  
BlackRock Long Government Credit Bond Index Fund36,695  15,200  
Total investments304,822  253,955  
Employer contribution receivable—  —  
Total$304,822  $253,955  
Schedule of fair value of plan assets, set forth by level, within the fair value hierarchy
The following table sets forth by level, within the fair value hierarchy, the Qualified Pension Plan’s assets at fair value as of December 31, 2019:
 Level 1Level 2Level 3Total
 (Dollars In Thousands)
Cash$3,713  $—  $—  $3,713  
Equity securities189,362  —  —  189,362  
Fixed income36,695  —  —  36,695  
Group deposit administration annuity contract—  —  75,052  75,052  
Total investments$229,770  $—  $75,052  $304,822  
The following table sets forth by level, within the fair value hierarchy, the Qualified Pension Plan’s assets at fair value as of December 31, 2018:
 Level 1Level 2Level 3Total
 (Dollars In Thousands)
Cash$1,225  $—  $—  $1,225  
Equity securities158,823  —  —  158,823  
Fixed income15,200  —  —  15,200  
Group deposit administration annuity contract—  —  78,707  78,707  
Total investments$175,248  $—  $78,707  $253,955  
The following table sets forth by level, within the fair value hierarchy, the life insurance plan’s assets at fair value as of December 31, 2019:
 Level 1Level 2Level 3Total
 (Dollars In Thousands)
Money market fund$4,610  $—  $—  $4,610  
The following table sets forth by level, within the fair value hierarchy, the life insurance plan’s assets at fair value as of December 31, 2018:
 Level 1Level 2Level 3Total
 (Dollars In Thousands)
Money market fund$4,854  $—  $—  $4,854  
Reconciliation of the beginning and ending balances for fair value measurements for which significant unobservable inputs (level 3) have been used
The following table presents a reconciliation of the beginning and ending balances for the fair value measurements for the year ended December 31, 2019 and for the year ended December 31, 2018 for which PLC has used significant unobservable inputs (Level 3):
 December 31, 2019December 31, 2018
 (Dollars In Thousands)
Balance, beginning of year$78,707  $74,886  
Interest income3,845  3,821  
Transfers from collective short-term investments fund—  —  
Transfers to collective short-term investments fund(7,500) —  
Balance, end of year$75,052  $78,707  
Schedule of Plan's Level 3 financial instrument, the valuation technique used, and the significant unobservable input and the ranges of values for that input
The following table represents the Plan’s Level 3 financial instrument, the valuation technique used, and the significant unobservable input and the ranges of values for that input as of December 31, 2019:
InstrumentFair ValuePrincipal
Valuation
Technique		Significant
Unobservable
Inputs		Range of
Significant Input
Values
 (Dollars In Thousands)   
Group deposit administration annuity contract$75,052  Contract ValueContract Rate
5.01% - 5.08%
Schedule of accumulated postretirement benefit obligation The benefit obligation associated with these benefits is as follows:
As of December 31,
Postretirement Life Insurance Plan20192018
 (Dollars In Thousands)
Change in Benefit Obligation 
Benefit obligation, beginning of year$10,012  $10,978  
Service cost124  153  
Interest cost405  366  
Actuarial (gain)/loss2,285  (1,045) 
Benefits paid(404) (440) 
Benefit obligation, end of year$12,422  $10,012