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Retirement Plans (Tables)
 12 Months Ended
Dec. 31, 2021
Retirement Benefits [Abstract]  
Change in Benefit Obligation
The funded status and amounts recognized on the 2021 and 2020 consolidated balance sheets, as measured on December 31, 2021 and 2020, respectively, for the RAP and Postretirement Plan were as follows:
 RAPPostretirement
Plan		RAPPostretirement
Plan
($ in Thousands)2021202120202020
Change in Fair Value of Plan Assets
Fair value of plan assets at beginning of year$478,849 $— $442,034 $— 
Actual return on plan assets41,576 — 58,802 — 
Employer contributions— 201 — 210 
Gross benefits paid(22,629)(201)(21,987)(210)
Fair value of plan assets at end of year(a)
$497,796 $— $478,849 $— 
Change in Benefit Obligation
Net benefit obligation at beginning of year$280,017 $2,243 $260,576 $2,545 
Service cost7,779 — 8,244 — 
Interest cost
6,570 52 8,185 78 
Plan amendments(1,494)— — — 
Actuarial (gain) loss(8,921)(119)24,998 (169)
Gross benefits paid(22,629)(201)(21,987)(210)
Net benefit obligation at end of year(a)
$261,321 $1,975 $280,017 $2,243 
Funded (unfunded) status$236,475 $(1,975)$198,832 $(2,243)
Noncurrent assets$236,475 $— $198,832 $— 
Current liabilities— (177)— (189)
Noncurrent liabilities— (1,798)— (2,055)
Asset (liability) recognized on the consolidated balance sheets$236,475 $(1,975)$198,832 $(2,243)
(a) The fair value of the plan assets represented 190% and 171% of the net benefit obligation of the pension plan at December 31, 2021 and 2020, respectively.
AOCI Components
Amounts recognized in accumulated other comprehensive (income) loss, net of tax, as of December 31, 2021 and 2020 were as follows:
RAPPostretirement
Plan		RAPPostretirement
Plan
($ in Thousands)2021202120202020
Prior service cost$(1,253)$(419)$(194)$(477)
Net actuarial loss5,605 (89)28,029 — 
Amount not yet recognized in net periodic benefit cost, but recognized in accumulated other comprehensive (income) loss$4,352 $(508)$27,835 $(477)
Changes in OCI
Other changes in plan assets and benefit obligations recognized in OCI, net of tax, in 2021 and 2020 were as follows:
RAPPostretirement
Plan		RAPPostretirement
Plan
($ in Thousands)2021202120202020
Net actuarial gain$25,257 $119 $8,209 $169 
Amortization of prior service cost(73)(75)(73)(75)
Amortization of actuarial loss4,594 — 3,897 — 
Prior service cost1,494 — — — 
Income tax (expense)(7,791)(11)(3,040)(23)
Total Recognized in OCI$23,480 $33 $8,993 $71 
Net period benefit cost for the pension plans
The components of net pension cost for the RAP for 2021, 2020, and 2019 were as follows:
($ in Thousands)202120202019
Service cost$7,779 $8,244 $7,263 
Interest cost6,570 8,185 9,752 
Expected return on plan assets(25,675)(25,595)(24,332)
Amortization of prior service cost(73)(73)(73)
Amortization of actuarial loss 4,594 3,897 480 
Recognized settlement loss 434 — — 
Total net periodic pension (income)$(6,370)$(5,342)$(6,910)
Net period benefit cost for postretirement plan
The components of net periodic benefit cost for the Postretirement Plan for 2021, 2020, and 2019 were as follows:
($ in Thousands)202120202019
Interest cost$52 $78 $104 
Amortization of prior service cost(75)(75)(75)
Amortization of actuarial (gain)— — (4)
Total net periodic benefit cost (income)$(24)$3 $25 
Weighted Average Benefit Assumptions
RAPPostretirement
 Plan		RAPPostretirement
Plan
2021202120202020
Weighted average assumptions used to determine benefit obligations
Discount rate2.80 %2.80 %2.40 %2.40 %
Rate of increase in compensation levels2.50 %N/A2.00 %N/A
Interest crediting rate3.07 %N/A3.24 %N/A
Weighted average assumptions used to determine net periodic benefit costs
Discount rate
2.40 %2.40 %3.20 %3.20 %
Rate of increase in compensation levels2.00 %N/A2.00 %N/A
Expected long-term rate of return on plan assets
6.00 %N/A6.20 %N/A
Plan Asset Allocation Percentages The asset allocation for the RAP as of the December 31, 2021 and 2020 measurement dates, respectively, by asset category were as follows:
Asset Category20212020
Equity securities55 %53 %
Fixed-income securities34 %33 %
Group annuity contracts10 %11 %
Alternative securities— %1 %
Other1 %2 %
Total100 %100 %
Pension Plan Investments
Based on these inputs, the following table summarizes the fair value of the RAP’s investments as of December 31, 2021 and 2020:
  Fair Value Measurements Using
($ in Thousands)December 31, 2021Level 1Level 2Level 3
RAP Investments
Money market account$5,446 $5,446 $— $— 
Common /collective trust funds185,791 185,791 — — 
Mutual funds257,345 257,345 — — 
Group annuity contracts49,213 — — 49,213 
Total RAP investments$497,796 $448,582 $— $49,213 
 Fair Value Measurements Using
($ in Thousands)December 31, 2020Level 1Level 2Level 3
RAP Investments
Money market account$9,429 $9,429 $— $— 
Common /collective trust funds172,950 172,950 — — 
Mutual funds245,605 245,605 — — 
Group annuity contracts50,866 — — 50,866 
Total RAP investments$478,849 $427,983 $— $50,866 
Schedule of Changes in Fair Value of Plan Assets
The following presents a summary of the changes in the fair value of the RAP's Level 3 asset during the periods indicated.
Fair Value Reconciliation of Level 3 RAP Investments20212020
Fair value of group annuity contract at beginning of period$50,866 $50,055 
Return on plan assets921 3,499 
Transfers from money market funds and equity securities66 — 
Benefits paid(2,640)(2,688)
Fair value of group annuity contract at end of period$49,213 $50,866 
Expected Benefit Payments
The projected benefit payments were calculated using the same assumptions as those used to calculate the benefit obligations listed above. The projected benefit payments for the RAP and Postretirement Plan at December 31, 2021, reflecting expected future services, were as follows:
($ in Thousands)RAPPostretirement Plan
Estimated future benefit payments
2022$16,398 $180 
202315,956 175 
202416,897 169 
202518,555 163 
202617,051 156 
2027-203177,883 674