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Employee Benefit Plans, Defined Benefit Post-Retirement Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined benefit plan disclosure [Abstract]      
Transition obligation period of recognition 20 years    
Assumptions used to determine benefit obligations [Abstract]      
Expected long-term return on plan assets 6.70% 7.00% 7.00%
Rate of compensation increase 3.00% 3.00% 3.00%
Interest rate of credit for cash balance plan 1.94% 1.62% 2.28%
Assumptions used to determine net periodic pension cost [Abstract]      
Expected long-term return on plan assets 7.00% 7.00% 7.00%
Rate of compensation increase 3.00% 3.00% 3.00%
Interest rate of credit for cash balance plan 1.62% 2.28% 3.36%
Other changes in plan assets and benefit obligation recognized in OCI (pre-tax) [Abstract]      
Net (gain) loss $ (3,780) $ (429) $ (5,331)
Amortization of unrecognized net (loss) $ 945 $ 107 $ 1,333
Estimate future benefit payments [Abstract]      
Ultimate health care cost trend rate 3.80%    
Actual plan asset allocations [Abstract]      
Actual plan asset allocations 100.00% 100.00%  
Minimum [Member]      
Assumptions used to determine benefit obligations [Abstract]      
Discount rate 3.23% 3.08% 3.69%
Assumptions used to determine net periodic pension cost [Abstract]      
Discount rate 3.08% 3.69% 4.79%
Estimate future benefit payments [Abstract]      
Annual rates of increase in the per capita cost of covered medical and prescription drug benefits, 4.50%    
Maximum [Member]      
Assumptions used to determine benefit obligations [Abstract]      
Discount rate 3.35% 3.25% 3.73%
Assumptions used to determine net periodic pension cost [Abstract]      
Discount rate 3.25% 3.73% 4.80%
Estimate future benefit payments [Abstract]      
Annual rates of increase in the per capita cost of covered medical and prescription drug benefits, 7.00%    
Pension Benefits [Member]      
Accumulated other comprehensive income (loss), before tax [Abstract]      
Net actuarial loss (gain) $ 21,608 $ 26,108  
Prior service cost (credit) 320 378  
Total amounts recognized in AOCI (pre-tax) 21,928 26,486  
Change in benefit obligation [Roll Forward]      
Benefit obligation at beginning of year 90,194 90,586  
Service cost 2,069 1,840 $ 1,723
Interest cost 2,717 3,237 3,942
Plan participants' contributions 0 0  
Actuarial loss (gain) 499 3,411  
Curtailments 0 (67)  
Benefits paid (6,560) (8,813)  
Projected benefit obligation at end of year 88,919 90,194 90,586
Change in plan assets [Roll Forward]      
Fair value of plan assets at beginning of year 128,563 122,995  
Gain on plan assets 12,523 12,449  
Employer contributions 1,341 1,932  
Plan participants' contributions 0 0  
Benefits paid (6,560) (8,813)  
Fair value of plan assets at end of year 135,867 128,563 122,995
Funded (unfunded) status at year end 46,948 38,369  
Accumulated benefit obligation 88,900 90,200  
Amounts recognized in Balance Sheet [Abstract]      
Funded (unfunded) status at year end 46,948 38,369  
Components of net periodic (benefit) cost [Abstract]      
Service cost 2,069 1,840 1,723
Interest cost 2,717 3,237 3,942
Expected return on plan assets (8,786) (8,410) (7,480)
Additional gain due to curtailment 0 (74) 0
Amortization of prior service cost 59 41 43
Amortization of unrecognized net loss 1,263 1,535 2,593
Net periodic pension (benefit) cost (2,678) (1,831) 821
Other changes in plan assets and benefit obligation recognized in OCI (pre-tax) [Abstract]      
Net (gain) loss (3,237) (628) (4,611)
Prior service cost 0 0 0
Additional gain due to curtailment 0 7 0
Amortization of prior service cost (59) (41) (43)
Amortization of unrecognized net (loss) (1,263) (1,535) (2,593)
Total recognized in OCI (4,559) (2,197) (7,247)
Total recognized in net periodic (benefit) cost and OCI, pre-tax (7,237) (4,028) (6,426)
Estimate future benefit payments [Abstract]      
2022 7,185    
2023 6,831    
2024 7,111    
2025 7,460    
2026 6,951    
2027 - 2031 32,437    
Employer voluntary contribution to plan 0 0  
Pension Benefits [Member] | Other Assets [Member]      
Amounts recognized in Balance Sheet [Abstract]      
Assets recognized 65,638 57,456  
Pension Benefits [Member] | Other Liabilities [Member]      
Amounts recognized in Balance Sheet [Abstract]      
Liabilities recognized $ (18,690) $ (19,087)  
Pension Benefits [Member] | Cash and Cash Equivalents [Member]      
Actual plan asset allocations [Abstract]      
Actual plan asset allocations 2.00% 3.00%  
Pension Benefits [Member] | Cash and Cash Equivalents [Member] | Minimum [Member]      
Target asset allocations [Abstract]      
Target allocation percentage of assets 0.00%    
Pension Benefits [Member] | Cash and Cash Equivalents [Member] | Maximum [Member]      
Target asset allocations [Abstract]      
Target allocation percentage of assets 15.00%    
Pension Benefits [Member] | Fixed Income Securities [Member]      
Actual plan asset allocations [Abstract]      
Actual plan asset allocations 37.00% 38.00%  
Pension Benefits [Member] | Fixed Income Securities [Member] | Minimum [Member]      
Target asset allocations [Abstract]      
Target allocation percentage of assets 30.00%    
Pension Benefits [Member] | Fixed Income Securities [Member] | Maximum [Member]      
Target asset allocations [Abstract]      
Target allocation percentage of assets 60.00%    
Pension Benefits [Member] | Equities [Member]      
Actual plan asset allocations [Abstract]      
Actual plan asset allocations 61.00% 59.00%  
Pension Benefits [Member] | Equities [Member] | Minimum [Member]      
Target asset allocations [Abstract]      
Target allocation percentage of assets 40.00%    
Pension Benefits [Member] | Equities [Member] | Maximum [Member]      
Target asset allocations [Abstract]      
Target allocation percentage of assets 70.00%    
Other Benefits [Member]      
Accumulated other comprehensive income (loss), before tax [Abstract]      
Net actuarial loss (gain) $ (226) $ 317  
Prior service cost (credit) (8) 43  
Total amounts recognized in AOCI (pre-tax) (234) 360  
Change in benefit obligation [Roll Forward]      
Benefit obligation at beginning of year 5,999 6,083  
Service cost 8 8 7
Interest cost 163 213 272
Plan participants' contributions 160 173  
Actuarial loss (gain) (543) 191  
Curtailments 0 0  
Benefits paid (635) (669)  
Projected benefit obligation at end of year 5,152 5,999 6,083
Change in plan assets [Roll Forward]      
Fair value of plan assets at beginning of year 0 0  
Gain on plan assets 0 0  
Employer contributions 475 496  
Plan participants' contributions 160 173  
Benefits paid (635) (669)  
Fair value of plan assets at end of year 0 0 0
Funded (unfunded) status at year end (5,152) (5,999)  
Accumulated benefit obligation 5,200 6,000  
Amounts recognized in Balance Sheet [Abstract]      
Funded (unfunded) status at year end (5,152) (5,999)  
Components of net periodic (benefit) cost [Abstract]      
Service cost 8 8 7
Interest cost 163 213 272
Expected return on plan assets 0 0 0
Additional gain due to curtailment 0 0 0
Amortization of prior service cost 51 51 50
Amortization of unrecognized net loss 0 0 0
Net periodic pension (benefit) cost 222 272 329
Other changes in plan assets and benefit obligation recognized in OCI (pre-tax) [Abstract]      
Net (gain) loss (543) 192 (720)
Prior service cost 0 0 0
Additional gain due to curtailment 0 0 0
Amortization of prior service cost (51) (51) (50)
Amortization of unrecognized net (loss) 0 0 0
Total recognized in OCI (594) 141 (770)
Total recognized in net periodic (benefit) cost and OCI, pre-tax (372) 413 $ (441)
Estimate future benefit payments [Abstract]      
2022 397    
2023 394    
2024 390    
2025 385    
2026 380    
2027 - 2031 1,690    
Employer voluntary contribution to plan 0 0  
Other Benefits [Member] | Other Assets [Member]      
Amounts recognized in Balance Sheet [Abstract]      
Assets recognized 0 0  
Other Benefits [Member] | Other Liabilities [Member]      
Amounts recognized in Balance Sheet [Abstract]      
Liabilities recognized $ (5,152) $ (5,999)