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Employee Benefit Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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 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%
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 2.28% 3.36% 2.80%
Other changes in plan assets and benefit obligation recognized in OCI (pre-tax) [Abstract]      
Net (gain) loss $ (429) $ (5,331) $ 12,457
Amortization of unrecognized net (loss) $ 107 $ 1,333 $ (3,038)
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 3.08% 3.69% 4.79%
Assumptions used to determine net periodic pension cost [Abstract]      
Discount rate 3.69% 4.79% 4.20%
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 3.25% 3.73% 4.80%
Assumptions used to determine net periodic pension cost [Abstract]      
Discount rate 3.73% 4.80% 4.21%
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 $ 26,108 $ 28,334  
Prior service cost 378 491  
Total amounts recognized in AOCI (pre-tax) 26,486 28,825  
Change in benefit obligation [Roll Forward]      
Benefit obligation at beginning of year 90,586 85,134  
Service cost 1,840 1,723 $ 1,659
Interest cost 3,237 3,942 3,645
Plan participants' contributions 0 0  
Actuarial loss (gain) 3,411 6,030  
Curtailments (67) 0  
Benefits paid (8,813) (6,243)  
Projected benefit obligation at end of year 90,194 90,586 85,134
Change in plan assets [Roll Forward]      
Fair value of plan assets at beginning of year 122,995 109,746  
Gain on plan assets 12,449 18,120  
Employer contributions 1,932 1,372  
Plan participants' contributions 0 0  
Benefits paid (8,813) (6,243)  
Fair value of plan assets at end of year 128,563 122,995 109,746
Funded (unfunded) status at year end 38,369 32,409  
Accumulated benefit obligation 90,200 90,600  
Amounts recognized in Balance Sheet [Abstract]      
Funded (unfunded) status at year end 38,369 32,409  
Components of net periodic (benefit) cost [Abstract]      
Service cost 1,840 1,723 1,659
Interest cost 3,237 3,942 3,645
Expected return on plan assets (8,410) (7,480) (8,478)
Additional gain due to curtailment (74) 0 0
Amortization of prior service cost 41 43 40
Amortization of unrecognized net loss 1,535 2,593 930
Net periodic pension (benefit) cost (1,831) 821 (2,204)
Other changes in plan assets and benefit obligation recognized in OCI (pre-tax) [Abstract]      
Net (gain) loss (628) (4,611) 12,882
Prior service cost 0 0 337
Additional gain due to curtailment 7 0 0
Amortization of prior service cost (41) (43) (40)
Amortization of unrecognized net (loss) (1,535) (2,593) (930)
Total recognized in OCI (2,197) (7,247) 12,249
Total recognized in net periodic (benefit) cost and OCI, pre-tax (4,028) (6,426) 10,045
Estimate future benefit payments [Abstract]      
2021 6,910    
2022 6,977    
2023 6,807    
2024 7,083    
2025 7,409    
2026 - 2030 33,579    
Employer voluntary contribution to plan 0 0  
Pension Benefits [Member] | Other Assets [Member]      
Amounts recognized in Balance Sheet [Abstract]      
Assets recognized 57,456 51,988  
Pension Benefits [Member] | Other Liabilities [Member]      
Amounts recognized in Balance Sheet [Abstract]      
Liabilities recognized $ (19,087) $ (19,579)  
Pension Benefits [Member] | Cash and Cash Equivalents [Member]      
Actual plan asset allocations [Abstract]      
Actual plan asset allocations 3.00% 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 38.00% 40.00%  
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 59.00% 57.00%  
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 $ 317 $ 125  
Prior service cost 43 94  
Total amounts recognized in AOCI (pre-tax) 360 219  
Change in benefit obligation [Roll Forward]      
Benefit obligation at beginning of year 6,083 7,034  
Service cost 8 7 10
Interest cost 213 272 327
Plan participants' contributions 173 201  
Actuarial loss (gain) 191 (719)  
Curtailments 0 0  
Benefits paid (669) (712)  
Projected benefit obligation at end of year 5,999 6,083 7,034
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 496 511  
Plan participants' contributions 173 201  
Benefits paid (669) (712)  
Fair value of plan assets at end of year 0 0 0
Funded (unfunded) status at year end (5,999) (6,083)  
Accumulated benefit obligation 6,000 6,100  
Amounts recognized in Balance Sheet [Abstract]      
Funded (unfunded) status at year end (5,999) (6,083)  
Components of net periodic (benefit) cost [Abstract]      
Service cost 8 7 10
Interest cost 213 272 327
Expected return on plan assets 0 0 0
Additional gain due to curtailment 0 0 0
Amortization of prior service cost 51 50 51
Amortization of unrecognized net loss 0 0 124
Net periodic pension (benefit) cost 272 329 512
Other changes in plan assets and benefit obligation recognized in OCI (pre-tax) [Abstract]      
Net (gain) loss 192 (720) (762)
Prior service cost 0 0 0
Additional gain due to curtailment 0 0 0
Amortization of prior service cost (51) (50) (51)
Amortization of unrecognized net (loss) 0 0 (124)
Total recognized in OCI 141 (770) (937)
Total recognized in net periodic (benefit) cost and OCI, pre-tax 413 (441) $ (425)
Estimate future benefit payments [Abstract]      
2021 453    
2022 451    
2023 448    
2024 443    
2025 436    
2026 - 2030 1,962    
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 $ (5,999) $ (6,083)