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Retirement Benefit Plans - Defined Benefit Plan Disclosures (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets $ 67,055 $ 63,893  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 63,893    
Fair Value of Plan Assets, End of Period 67,055 63,893  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 67,055 $ 63,893  
Percent of Total 100.00% 100.00%  
Expected Future Benefit Payments      
Health Care Cost Trend   Rate Assumed for Next Year 8.50% 7.75%  
Rate to which the Cost Trend   Rate is Assumed to Decline   (the Ultimate Trend Rate) 4.04% 4.04%  
Year that the Rate Reaches    the Ultimate Trend Rate 2075 2075  
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets $ 67,055 $ 63,893  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 63,893    
Fair Value of Plan Assets, End of Period 67,055 63,893  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 67,055 63,893  
Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 0 0  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 0    
Fair Value of Plan Assets, End of Period 0 0  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 0 0  
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 0 0  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 0    
Fair Value of Plan Assets, End of Period 0 0  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 0 0  
Cash      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 0 0  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 0    
Fair Value of Plan Assets, End of Period 0 0  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 0 $ 0  
Percent of Total 0.00% 0.00%  
Cash | Minimum      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage 0.00% 0.00%  
Cash | Maximum      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage 15.00% 15.00%  
Cash | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets $ 0 $ 0  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 0    
Fair Value of Plan Assets, End of Period 0 0  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 0 0  
Cash | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 0 0  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 0    
Fair Value of Plan Assets, End of Period 0 0  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 0 0  
Cash | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 0 0  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 0    
Fair Value of Plan Assets, End of Period 0 0  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 0 0  
Interest-Bearing Money Market Fund      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 484 2,699  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 2,699    
Fair Value of Plan Assets, End of Period 484 2,699  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 484 $ 2,699  
Percent of Total 0.70% 4.20%  
Interest-Bearing Money Market Fund | Minimum      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage 0.00% 0.00%  
Interest-Bearing Money Market Fund | Maximum      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage 15.00% 15.00%  
Interest-Bearing Money Market Fund | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets $ 484 $ 2,699  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 2,699    
Fair Value of Plan Assets, End of Period 484 2,699  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 484 2,699  
Interest-Bearing Money Market Fund | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 0 0  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 0    
Fair Value of Plan Assets, End of Period 0 0  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 0 0  
Interest-Bearing Money Market Fund | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 0 0  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 0    
Fair Value of Plan Assets, End of Period 0 0  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 0 0  
Common Stock      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 6,117 5,593  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 5,593    
Fair Value of Plan Assets, End of Period 6,117 5,593  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 6,117 $ 5,593  
Percent of Total 9.10% 8.80%  
Common Stock | Minimum      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage 0.00% 0.00%  
Common Stock | Maximum      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage 10.00% 10.00%  
Common Stock | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets $ 6,117 $ 5,593  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 5,593    
Fair Value of Plan Assets, End of Period 6,117 5,593  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 6,117 5,593  
Common Stock | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 0 0  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 0    
Fair Value of Plan Assets, End of Period 0 0  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 0 0  
Common Stock | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 0 0  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 0    
Fair Value of Plan Assets, End of Period 0 0  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 0 0  
North Country Funds - Equity      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 18,915 18,740  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 18,740    
Fair Value of Plan Assets, End of Period 18,915 18,740  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 18,915 $ 18,740  
Percent of Total 28.20% 29.30%  
North Country Funds - Equity | Minimum      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage  
North Country Funds - Equity | Maximum      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage  
North Country Funds - Equity | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets $ 18,915 $ 18,740  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 18,740    
Fair Value of Plan Assets, End of Period 18,915 18,740  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 18,915 18,740  
North Country Funds - Equity | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 0 0  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 0    
Fair Value of Plan Assets, End of Period 0 0  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 0 0  
North Country Funds - Equity | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 0 0  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 0    
Fair Value of Plan Assets, End of Period 0 0  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 0 0  
Other Mutual Funds - Equity      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 31,363 26,598  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 26,598    
Fair Value of Plan Assets, End of Period 31,363 26,598  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 31,363 $ 26,598  
Percent of Total 46.80% 41.60%  
Other Mutual Funds - Equity | Minimum      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage  
Other Mutual Funds - Equity | Maximum      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage  
Other Mutual Funds - Equity | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets $ 31,363 $ 26,598  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 26,598    
Fair Value of Plan Assets, End of Period 31,363 26,598  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 31,363 26,598  
Other Mutual Funds - Equity | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 0 0  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 0    
Fair Value of Plan Assets, End of Period 0 0  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 0 0  
Other Mutual Funds - Equity | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 0 0  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 0    
Fair Value of Plan Assets, End of Period 0 0  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 0 0  
Equity Funds      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 50,278 45,338  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 45,338    
Fair Value of Plan Assets, End of Period 50,278 45,338  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 50,278 $ 45,338  
Percent of Total 75.00% 70.90%  
Equity Funds | Minimum      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage 55.00% 55.00%  
Equity Funds | Maximum      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage 85.00% 85.00%  
Equity Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets $ 50,278 $ 45,338  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 45,338    
Fair Value of Plan Assets, End of Period 50,278 45,338  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 50,278 45,338  
Equity Funds | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 0 0  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 0    
Fair Value of Plan Assets, End of Period 0 0  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 0 0  
Equity Funds | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 0 0  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 0    
Fair Value of Plan Assets, End of Period 0 0  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 0 0  
Other Mutual Funds - Fixed Income      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 10,176 45,338  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 45,338    
Fair Value of Plan Assets, End of Period 10,176 45,338  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 10,176 $ 45,338  
Percent of Total 15.20% 16.10%  
Other Mutual Funds - Fixed Income | Minimum      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage 10.00%  
Other Mutual Funds - Fixed Income | Maximum      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage 30.00%  
Other Mutual Funds - Fixed Income | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets $ 10,176 $ 10,263  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 10,263    
Fair Value of Plan Assets, End of Period 10,176 10,263  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 10,176 10,263  
Other Mutual Funds - Fixed Income | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 0 0  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 0    
Fair Value of Plan Assets, End of Period 0 0  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 0 0  
Other Mutual Funds - Fixed Income | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 0 0  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 0    
Fair Value of Plan Assets, End of Period 0 0  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 0 0  
Fixed Income Funds      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets   10,263  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 10,263    
Fair Value of Plan Assets, End of Period   10,263  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets   $ 10,263  
Percent of Total   16.10%  
Fixed Income Funds | Minimum      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage   10.00%  
Fixed Income Funds | Maximum      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage   30.00%  
Fixed Income Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets   $ 10,263  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 10,263    
Fair Value of Plan Assets, End of Period   10,263  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets   10,263  
Fixed Income Funds | Significant Other Observable Inputs (Level 2)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets   0  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 0    
Fair Value of Plan Assets, End of Period   0  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets   0  
Fixed Income Funds | Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets   0  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 0    
Fair Value of Plan Assets, End of Period   0  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets   0  
Employees' Pension Plan      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 67,055 63,893 $ 59,199
Benefit Obligation 40,954 39,763 42,914
Funded Status of Plan 26,101 24,130  
Change in Benefit Obligation      
Benefit Obligation, Beginning of Period 39,763 42,914  
Service Cost 1,603 1,692 1,593
Interest Cost 2,324 2,242 2,099
Plan Participants' Contributions 0 0  
Amendments / Curtailments / Special Termination   441  
Actuarial Loss (Gain) 1,997 (3,256)  
Benefits Paid (4,733) (4,270)  
Benefit Obligation, End of Period 40,954 39,763 42,914
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 63,893 59,199  
Actual Return on Plan Assets 7,895 8,964  
Employer Contributions 0 0  
Plan Participants' Contributions 0 0  
Benefits Paid (4,733) (4,270)  
Fair Value of Plan Assets, End of Period 67,055 63,893 59,199
Accumulated Benefit Obligation at December 31, 2025 40,954    
Amounts Recognized in the Consolidated Balance Sheets      
Prepaid Pension Asset 26,101 24,130  
Accrued Benefit Liability 0 0  
Net Benefit (Expense) Recognized 26,101 24,130  
Amounts Recognized in Other Comprehensive (Loss) Income      
Net Unamortized Gain Arising During the Period (1,927) (8,509) (2,315)
Amortization of Net (Loss) Gain 0 0 (118)
Prior Service Cost   441 526
Amortization of Prior Service Cost (189) (131) (62)
Total Other Comprehensive (Loss) for Pension and Other Postretirement Benefit Plans (2,116) (8,199) (1,969)
Accumulated Other Comprehensive Income      
Net Actuarial Gain (6,295) (4,369)  
Prior Service Cost 961 1,150  
Total Accumulated Other Comprehensive (Loss), Before Tax (5,334) (3,219)  
Net Periodic Benefit Cost      
Service Cost 1,603 1,692 1,593
Interest Cost 2,324 2,242 2,099
Expected Return on Plan Assets (3,971) (3,710) (3,416)
Amortization of Prior Service Cost 189 131 62
Amortization of Net Loss (Gain) 0 0 118
Net Periodic Benefit Cost $ 145 $ 355 $ 456
Weighted-Average Assumptions Used in Calculating Benefit Obligation      
Discount Rate 5.99% 6.15%  
Rate of Compensation Increase 4.00% 4.00%  
Interest Rate Credit for Determining Projected Cash Balance Account 4.70% 4.54%  
Interest Rate Credit for Determining Projected Cash Balance Account, Segment One 4.07%    
Interest Rate Credit for Determining Projected Cash Balance Account, Segment Two 5.15%    
Interest Rate Credit for Determining Projected Cash Balance Account, Segment Three 6.01%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment One 4.07%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Two 5.15%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Three 6.01%    
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Discount Rate 5.99% 5.52% 5.59%
Expected Long-Term Return on Plan Assets 6.50% 6.50% 6.50%
Rate of Compensation Increase 4.00% 4.00% 3.50%
Interest Rate Credit for Determining Projected Cash Balance Account 4.54% 4.66% 3.99%
Interest Rate to Annuitize Cash Balance Account, Segment One 4.07% 4.66% 5.50%
Interest Rate to Annuitize Cash Balance Account, Segment Two 5.15% 5.25% 5.76%
Interest Rate to Annuitize Cash Balance Account, Segment Three 6.01% 5.57% 5.83%
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment One 4.07% 4.66% 5.50%
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Two 5.15% 5.25% 5.76%
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Three 6.01% 5.57% 5.83%
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Operating Expense Other Operating Expense Other Operating Expense
Fair Value of Plan Assets $ 67,055 $ 63,893 $ 59,199
Expected Future Benefit Payments      
2026 3,119    
2027 3,563    
2028 3,196    
2029 3,180    
2030 3,408    
2031 - 2035 16,806    
Estimated Contributions During 2026 0    
Select Executive Retirement Plan      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 0 0 0
Benefit Obligation 4,509 4,940 6,904
Funded Status of Plan (4,509) (4,940)  
Change in Benefit Obligation      
Benefit Obligation, Beginning of Period 4,940 6,904  
Service Cost 93 78 570
Interest Cost 298 320 336
Plan Participants' Contributions 0 0  
Amendments / Curtailments / Special Termination   0  
Actuarial Loss (Gain) (357) (1,770)  
Benefits Paid (465) (592)  
Benefit Obligation, End of Period 4,509 4,940 6,904
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 0 0  
Actual Return on Plan Assets 0 0  
Employer Contributions 465 592  
Plan Participants' Contributions 0 0  
Benefits Paid (465) (592)  
Fair Value of Plan Assets, End of Period 0 0 0
Accumulated Benefit Obligation at December 31, 2025 4,509    
Amounts Recognized in the Consolidated Balance Sheets      
Prepaid Pension Asset 0 0  
Accrued Benefit Liability (4,509) (4,940)  
Net Benefit (Expense) Recognized (4,509) (4,940)  
Amounts Recognized in Other Comprehensive (Loss) Income      
Net Unamortized Gain Arising During the Period (358) (1,770) 358
Amortization of Net (Loss) Gain 0 (24) (73)
Prior Service Cost   0 0
Amortization of Prior Service Cost (39) (39) (39)
Total Other Comprehensive (Loss) for Pension and Other Postretirement Benefit Plans (397) (1,833) 246
Accumulated Other Comprehensive Income      
Net Actuarial Gain (413) (55)  
Prior Service Cost 252 291  
Total Accumulated Other Comprehensive (Loss), Before Tax (161) 236  
Net Periodic Benefit Cost      
Service Cost 93 78 570
Interest Cost 298 320 336
Expected Return on Plan Assets 0 0 0
Amortization of Prior Service Cost 39 39 39
Amortization of Net Loss (Gain) 0 25 73
Net Periodic Benefit Cost $ 430 $ 462 $ 1,018
Weighted-Average Assumptions Used in Calculating Benefit Obligation      
Discount Rate 6.11% 6.21%  
Rate of Compensation Increase 4.00% 4.00%  
Interest Rate Credit for Determining Projected Cash Balance Account 4.70% 4.54%  
Interest Rate Credit for Determining Projected Cash Balance Account, Segment One 4.07%    
Interest Rate Credit for Determining Projected Cash Balance Account, Segment Two 5.15%    
Interest Rate Credit for Determining Projected Cash Balance Account, Segment Three 6.01%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment One 4.07%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Two 5.15%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Three 6.01%    
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Discount Rate 6.21% 5.53% 5.61%
Rate of Compensation Increase 4.00% 4.00% 3.50%
Interest Rate Credit for Determining Projected Cash Balance Account 4.54% 4.66% 3.99%
Interest Rate to Annuitize Cash Balance Account, Segment One 4.07% 4.66% 5.50%
Interest Rate to Annuitize Cash Balance Account, Segment Two 5.15% 5.25% 5.76%
Interest Rate to Annuitize Cash Balance Account, Segment Three 6.01% 5.57% 5.83%
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment One 4.07% 4.66% 5.50%
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Two 5.15% 5.25% 5.76%
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Three 6.01% 5.57% 5.76%
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Operating Expense Other Operating Expense Other Operating Expense
Fair Value of Plan Assets $ 0 $ 0 $ 0
Expected Future Benefit Payments      
2026 478    
2027 466    
2028 443    
2029 421    
2030 401    
2031 - 2035 1,823    
Estimated Contributions During 2026 478    
Postretirement Benefit Plans      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 0 0 0
Benefit Obligation 4,649 5,550 6,221
Funded Status of Plan (4,649) (5,550)  
Change in Benefit Obligation      
Benefit Obligation, Beginning of Period 5,550 6,221  
Service Cost 31 45 56
Interest Cost 279 320 332
Plan Participants' Contributions 535 483  
Amendments / Curtailments / Special Termination   0  
Actuarial Loss (Gain) (758) (497)  
Benefits Paid (988) (1,022)  
Benefit Obligation, End of Period 4,649 5,550 6,221
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 0 0  
Actual Return on Plan Assets 0 0  
Employer Contributions 453 539  
Plan Participants' Contributions 535 483  
Benefits Paid (988) (1,022)  
Fair Value of Plan Assets, End of Period 0 0 0
Accumulated Benefit Obligation at December 31, 2025 4,649    
Amounts Recognized in the Consolidated Balance Sheets      
Prepaid Pension Asset 0 0  
Accrued Benefit Liability (4,649) (5,550)  
Net Benefit (Expense) Recognized (4,649) (5,550)  
Amounts Recognized in Other Comprehensive (Loss) Income      
Net Unamortized Gain Arising During the Period (758) (498) (397)
Amortization of Net (Loss) Gain 510 337 353
Prior Service Cost   0 0
Amortization of Prior Service Cost (102) (102) (104)
Total Other Comprehensive (Loss) for Pension and Other Postretirement Benefit Plans (350) (263) (148)
Accumulated Other Comprehensive Income      
Net Actuarial Gain (3,049) (2,801)  
Prior Service Cost 58 160  
Total Accumulated Other Comprehensive (Loss), Before Tax (2,991) (2,641)  
Net Periodic Benefit Cost      
Service Cost 31 45 56
Interest Cost 279 320 332
Expected Return on Plan Assets 0 0 0
Amortization of Prior Service Cost 102 102 104
Amortization of Net Loss (Gain) (510) (337) (353)
Net Periodic Benefit Cost $ (98) $ 130 $ 139
Weighted-Average Assumptions Used in Calculating Benefit Obligation      
Discount Rate 6.07% 6.12%  
Rate of Compensation Increase 4.00% 4.00%  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Discount Rate 6.12% 5.51% 5.62%
Rate of Compensation Increase 4.00% 4.00% 3.50%
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Other Operating Expense Other Operating Expense Other Operating Expense
Fair Value of Plan Assets $ 0 $ 0 $ 0
Expected Future Benefit Payments      
2026 503    
2027 538    
2028 524    
2029 517    
2030 514    
2031 - 2035 2,037    
Estimated Contributions During 2026 $ 503