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Retirement Benefit Plans (Details)
12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Interest credit under cash balance plan 0.030    
Employer matching contribution, percent of match, maximum 5.00%    
Defined benefit plan, service cost and interest cost $ 3,300,000    
Defined benefit plan, unamortized net loss $ 7,200,000    
Defined benefit plan, benefit obligation from lump sum payment to total benefit obligation ratio 8.06%    
Defined benefit plan, net periodic benefit cost, loss due to settlement $ 577,000    
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 54,300,000 $ 68,925,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 68,925,000    
Fair Value of Plan Assets, End of Period 54,300,000 $ 68,925,000  
Net Periodic Benefit Cost      
Settlement Cost $ 577,000    
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
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 $ 54,300,000 $ 68,925,000  
Percent of Total 100.00% 100.00%  
Expected Future Benefit Payments      
Health Care Cost Trend   Rate Assumed for Next Year 7.75% 7.00%  
Rate to which the Cost Trend   Rate is Assumed to Decline   (the Ultimate Trend Rate) 4.04% 3.78%  
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 $ 54,300,000 $ 68,925,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 68,925,000    
Fair Value of Plan Assets, End of Period 54,300,000 68,925,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 54,300,000 68,925,000  
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 | 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 1,291,000 2,439,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 2,439,000    
Fair Value of Plan Assets, End of Period 1,291,000 2,439,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 1,291,000 $ 2,439,000  
Percent of Total 2.40% 3.50%  
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 $ 1,291,000 $ 2,439,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 2,439,000    
Fair Value of Plan Assets, End of Period 1,291,000 2,439,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 1,291,000 2,439,000  
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 6,411,000 6,469,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 6,469,000    
Fair Value of Plan Assets, End of Period 6,411,000 6,469,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 6,411,000 $ 6,469,000  
Percent of Total 11.80% 9.40%  
Common Stock | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets $ 6,411,000 $ 6,469,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 6,469,000    
Fair Value of Plan Assets, End of Period 6,411,000 6,469,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 6,411,000 6,469,000  
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 20,714,000 29,490,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 29,490,000    
Fair Value of Plan Assets, End of Period 20,714,000 29,490,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 20,714,000 $ 29,490,000  
Percent of Total 38.20% 42.80%  
North Country Funds - Equity | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets $ 20,714,000 $ 29,490,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 29,490,000    
Fair Value of Plan Assets, End of Period 20,714,000 29,490,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 20,714,000 29,490,000  
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 15,059,000 16,761,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 16,761,000    
Fair Value of Plan Assets, End of Period 15,059,000 16,761,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 15,059,000 $ 16,761,000  
Percent of Total 27.70% 24.30%  
Other Mutual Funds - Equity | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets $ 15,059,000 $ 16,761,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 16,761,000    
Fair Value of Plan Assets, End of Period 15,059,000 16,761,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 15,059,000 16,761,000  
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 35,773,000 46,251,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 46,251,000    
Fair Value of Plan Assets, End of Period 35,773,000 46,251,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 35,773,000 $ 46,251,000  
Percent of Total 65.90% 67.10%  
Equity Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets $ 35,773,000 $ 46,251,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 46,251,000    
Fair Value of Plan Assets, End of Period 35,773,000 46,251,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 35,773,000 46,251,000  
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  
North Country Funds - Fixed Income      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets   6,317,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 6,317,000    
Fair Value of Plan Assets, End of Period   6,317,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets   $ 6,317,000  
Percent of Total   9.20%  
North Country Funds - Fixed Income | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets   $ 6,317,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 6,317,000    
Fair Value of Plan Assets, End of Period   6,317,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets   6,317,000  
North Country Funds - Fixed Income | 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  
North Country Funds - Fixed Income | 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  
Other Mutual Funds - Fixed Income      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 6,094,000 2,675,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 2,675,000    
Fair Value of Plan Assets, End of Period 6,094,000 2,675,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 6,094,000 $ 2,675,000  
Percent of Total 11.20% 3.90%  
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 $ 6,094,000 $ 2,675,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 2,675,000    
Fair Value of Plan Assets, End of Period 6,094,000 2,675,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 6,094,000 2,675,000  
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 6,094,000 8,992,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 8,992,000    
Fair Value of Plan Assets, End of Period 6,094,000 8,992,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 6,094,000 $ 8,992,000  
Percent of Total 11.20% 13.10%  
Fixed Income Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets $ 6,094,000 $ 8,992,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 8,992,000    
Fair Value of Plan Assets, End of Period 6,094,000 8,992,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 6,094,000 8,992,000  
Fixed Income 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  
Fixed Income 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  
Alternative ETF      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 4,731,000 4,774,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 4,774,000    
Fair Value of Plan Assets, End of Period 4,731,000 4,774,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 4,731,000 $ 4,774,000  
Percent of Total 8.70% 6.90%  
Alternative ETF | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets $ 4,731,000 $ 4,774,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 4,774,000    
Fair Value of Plan Assets, End of Period 4,731,000 4,774,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 4,731,000 4,774,000  
Alternative ETF | 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  
Alternative ETF | 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  
Employees' Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Assumptions used calculating benefit obligation, interest rate to annuitize cash balance account 5.09%    
Defined benefit plan, increase in benefit payable, percent 3.00%    
Defined benefit plan, benefit obligation, increase (decrease) for plan amendment $ 351,638    
Defined benefit plan, amortization of service cost 9 years 8 months 12 days    
Defined benefit plan, net periodic benefit cost, loss due to settlement $ 577,000    
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 54,300,000 68,925,000 $ 59,837,000
Benefit Obligation 39,528,000 45,659,000 44,877,000
Funded Status of Plan 14,772,000 23,266,000  
Change in Benefit Obligation      
Benefit Obligation, Beginning of Period 45,659,000 44,877,000  
Service Cost 1,877,000 1,934,000 1,663,000
Interest Cost 1,439,000 1,365,000 1,544,000
Plan Participants' Contributions 0 0  
Actuarial Gain (4,555,000) (347,000)  
Benefits Paid (4,892,000) (2,170,000)  
Benefit Obligation, End of Period 39,528,000 45,659,000 44,877,000
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 68,925,000 59,837,000  
Actual Return on Plan Assets (9,733,000) 11,258,000  
Employer Contributions 0 0  
Plan Participants' Contributions 0 0  
Benefits Paid (4,892,000) (2,170,000)  
Fair Value of Plan Assets, End of Period 54,300,000 68,925,000 59,837,000
Accumulated Benefit Obligation at December 31, 2022 39,506,000    
Amounts Recognized in the Consolidated Balance Sheets      
Prepaid Pension Asset 14,772,000 23,266,000  
Accrued Benefit Liability 0 0  
Net Benefit (Expense) Recognized 14,772,000 23,266,000  
Amounts Recognized in Other Comprehensive Income (Loss)      
Net Unamortized Loss (Gain) Arising During the Period 9,492,000 (7,826,000) (182,000)
Net Prior Service Cost Arising During the Period     349,000
Amortization of Net (Loss) Gain 0 0 (81,000)
Amortization of Prior Service Cost (78,000) (78,000) (63,000)
Settlement Cost (577,000)    
Total Other Comprehensive Income (Loss) for Pension and Other Postretirement Benefit Plans 8,837,000 (7,904,000) 23,000
Accumulated Other Comprehensive Income      
Net Actuarial Loss (Gain) 6,574,000 (2,341,000)  
Prior Service Cost 376,000 453,000  
Total Accumulated Other Comprehensive Income (Loss), Before Tax 6,950,000 (1,888,000)  
Net Periodic Benefit Cost      
Service Cost 1,877,000 1,934,000 1,663,000
Interest Cost 1,439,000 1,365,000 1,544,000
Expected Return on Plan Assets (4,314,000) (3,780,000) (3,608,000)
Amortization of Prior Service Cost 77,000 78,000 63,000
Amortization of Net Loss (Gain) 0 0 81,000
Settlement Cost 577,000    
Net Periodic Benefit (Income) Cost $ (344,000) $ (403,000) $ (257,000)
Weighted-Average Assumptions Used in Calculating Benefit Obligation      
Discount Rate 5.59% 3.30%  
Rate of Compensation Increase 3.50% 3.50%  
Interest Rate Credit for Determining Projected Cash Balance Account 3.99% 3.00%  
Interest Rate Credit for Determining Projected Cash Balance Account, Segment One 5.09%    
Interest Rate Credit for Determining Projected Cash Balance Account, Segment Two 5.60%    
Interest Rate Credit for Determining Projected Cash Balance Account, Segment Three 5.41%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment One 5.09%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Two 5.60%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Three 5.41%    
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Discount Rate 3.30% 3.14% 3.72%
Expected Long-Term Return on Plan Assets 6.50% 6.50% 6.50%
Rate of Compensation Increase 3.50% 3.50% 3.50%
Interest Rate Credit for Determining Projected Cash Balance Account 3.00% 3.00% 3.00%
Interest Rate to Annuitize Cash Balance Account, Segment One 5.09% 1.02%  
Interest Rate to Annuitize Cash Balance Account, Segment Two 5.60% 2.72%  
Interest Rate to Annuitize Cash Balance Account, Segment Three 5.41% 3.08%  
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment One 5.09% 1.02%  
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Two 5.60% 2.72%  
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Three 5.41% 3.08%  
Fair Value of Plan Assets $ 54,300,000 $ 68,925,000 $ 59,837,000
Expected Future Benefit Payments      
2023 3,192,000    
2024 3,469,000    
2025 3,215,000    
2026 2,778,000    
2027 3,299,000    
2028 - 2032 15,355,000    
Estimated Contributions During 2023 $ 0    
Select Executive Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Assumptions used calculating benefit obligation, interest rate to annuitize cash balance account 5.60%    
Defined benefit plan, amortization of service cost 12 years 6 months    
Defined benefit plan, benefit obligation, period increase (decrease) $ 122,797    
Defined benefit plan, net periodic benefit cost, loss due to settlement 0    
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 0 0 0
Benefit Obligation 6,070,000 6,455,000 5,820,000
Funded Status of Plan (6,070,000) (6,455,000)  
Change in Benefit Obligation      
Benefit Obligation, Beginning of Period 6,455,000 5,820,000  
Service Cost 835,000 582,000 408,000
Interest Cost 225,000 191,000 192,000
Plan Participants' Contributions 0 0  
Actuarial Gain (983,000) 332,000  
Benefits Paid (462,000) (470,000)  
Benefit Obligation, End of Period 6,070,000 6,455,000 5,820,000
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 462,000 470,000  
Plan Participants' Contributions 0 0  
Benefits Paid (462,000) (470,000)  
Fair Value of Plan Assets, End of Period 0 0 0
Accumulated Benefit Obligation at December 31, 2022 6,024,000    
Amounts Recognized in the Consolidated Balance Sheets      
Prepaid Pension Asset 0 0  
Accrued Benefit Liability (6,070,000) (6,455,000)  
Net Benefit (Expense) Recognized (6,070,000) (6,455,000)  
Amounts Recognized in Other Comprehensive Income (Loss)      
Net Unamortized Loss (Gain) Arising During the Period (983,000) 332,000 368,000
Net Prior Service Cost Arising During the Period     123,000
Amortization of Net (Loss) Gain (212,000) (178,000) (146,000)
Amortization of Prior Service Cost (44,000) (48,000) (42,000)
Settlement Cost 0    
Total Other Comprehensive Income (Loss) for Pension and Other Postretirement Benefit Plans (1,239,000) 106,000 303,000
Accumulated Other Comprehensive Income      
Net Actuarial Loss (Gain) 1,453,000 2,651,000  
Prior Service Cost 370,000 411,000  
Total Accumulated Other Comprehensive Income (Loss), Before Tax 1,823,000 3,062,000  
Net Periodic Benefit Cost      
Service Cost 835,000 582,000 408,000
Interest Cost 225,000 191,000 192,000
Expected Return on Plan Assets 0 0 0
Amortization of Prior Service Cost 44,000 48,000 42,000
Amortization of Net Loss (Gain) 212,000 179,000 146,000
Settlement Cost 0    
Net Periodic Benefit (Income) Cost $ 1,316,000 $ 1,000,000 $ 788,000
Weighted-Average Assumptions Used in Calculating Benefit Obligation      
Discount Rate 5.61% 3.29%  
Rate of Compensation Increase 3.50% 3.50%  
Interest Rate Credit for Determining Projected Cash Balance Account 3.99% 3.00%  
Interest Rate Credit for Determining Projected Cash Balance Account, Segment One 5.09%    
Interest Rate Credit for Determining Projected Cash Balance Account, Segment Two 5.60%    
Interest Rate Credit for Determining Projected Cash Balance Account, Segment Three 5.41%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment One 5.09%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Two 5.60%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Three 5.41%    
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Discount Rate 5.61% 3.19% 3.75%
Rate of Compensation Increase 3.50% 3.50% 3.50%
Interest Rate Credit for Determining Projected Cash Balance Account 3.99% 3.00% 3.00%
Interest Rate to Annuitize Cash Balance Account, Segment One 5.09% 1.02%  
Interest Rate to Annuitize Cash Balance Account, Segment Two 5.60% 2.72%  
Interest Rate to Annuitize Cash Balance Account, Segment Three 5.41% 3.08%  
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment One 5.09% 1.02%  
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Two 5.60% 2.72%  
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Three 5.41% 3.08%  
Fair Value of Plan Assets $ 0 $ 0 $ 0
Expected Future Benefit Payments      
2023 432,000    
2024 675,000    
2025 656,000    
2026 628,000    
2027 630,000    
2028 - 2032 2,736,000    
Estimated Contributions During 2023 $ 432,000    
Postretirement Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Assumptions used calculating benefit obligation, interest rate to annuitize cash balance account 5.41%    
Defined benefit plan, net periodic benefit cost, loss due to settlement $ 0    
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 0 0 0
Benefit Obligation 6,482,000 7,994,000 9,028,000
Funded Status of Plan (6,482,000) (7,994,000)  
Change in Benefit Obligation      
Benefit Obligation, Beginning of Period 7,994,000 9,028,000  
Service Cost 90,000 109,000 123,000
Interest Cost 248,000 249,000 310,000
Plan Participants' Contributions 427,000 432,000  
Actuarial Gain (1,571,000) (1,240,000)  
Benefits Paid (706,000) (584,000)  
Benefit Obligation, End of Period 6,482,000 7,994,000 9,028,000
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 279,000 152,000  
Plan Participants' Contributions 427,000 432,000  
Benefits Paid (706,000) (584,000)  
Fair Value of Plan Assets, End of Period 0 0 0
Accumulated Benefit Obligation at December 31, 2022 6,482,000    
Amounts Recognized in the Consolidated Balance Sheets      
Prepaid Pension Asset 0 0  
Accrued Benefit Liability (6,482,000) (7,994,000)  
Net Benefit (Expense) Recognized (6,482,000) (7,994,000)  
Amounts Recognized in Other Comprehensive Income (Loss)      
Net Unamortized Loss (Gain) Arising During the Period (1,571,000) (1,239,000) 151,000
Net Prior Service Cost Arising During the Period     0
Amortization of Net (Loss) Gain 156,000 87,000 0
Amortization of Prior Service Cost (106,000) (106,000) (106,000)
Settlement Cost 0    
Total Other Comprehensive Income (Loss) for Pension and Other Postretirement Benefit Plans (1,521,000) (1,258,000) 45,000
Accumulated Other Comprehensive Income      
Net Actuarial Loss (Gain) (2,597,000) (1,182,000)  
Prior Service Cost 366,000 472,000  
Total Accumulated Other Comprehensive Income (Loss), Before Tax (2,231,000) (710,000)  
Net Periodic Benefit Cost      
Service Cost 90,000 109,000 123,000
Interest Cost 248,000 249,000 310,000
Expected Return on Plan Assets 0 0 0
Amortization of Prior Service Cost 106,000 106,000 106,000
Amortization of Net Loss (Gain) (156,000) (88,000) 0
Settlement Cost 0    
Net Periodic Benefit (Income) Cost $ 288,000 $ 376,000 $ 539,000
Weighted-Average Assumptions Used in Calculating Benefit Obligation      
Discount Rate 5.62% 3.32%  
Rate of Compensation Increase 3.50% 3.50%  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Discount Rate 3.32% 3.17% 3.76%
Rate of Compensation Increase 3.50% 3.50% 3.50%
Fair Value of Plan Assets $ 0 $ 0 $ 0
Expected Future Benefit Payments      
2023 616,000    
2024 629,000    
2025 637,000    
2026 665,000    
2027 680,000    
2028 - 2032 2,910,000    
Estimated Contributions During 2023 $ 616,000    
Minimum | Cash      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage 0.00% 0.00%  
Minimum | Interest-Bearing Money Market Fund      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage 0.00% 0.00%  
Minimum | Common Stock      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage 0.00% 0.00%  
Minimum | North Country Funds - Equity      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage  
Minimum | Other Mutual Funds - Equity      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage  
Minimum | Equity Funds      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage 55.00% 55.00%  
Minimum | North Country Funds - Fixed Income      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage    
Minimum | Other Mutual Funds - Fixed Income      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage  
Minimum | Fixed Income Funds      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage 10.00% 10.00%  
Minimum | Alternative ETF      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage 0.00% 0.00%  
Maximum | Cash      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage 15.00% 15.00%  
Maximum | Interest-Bearing Money Market Fund      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage 15.00% 15.00%  
Maximum | Common Stock      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage 10.00% 10.00%  
Maximum | North Country Funds - Equity      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage  
Maximum | Other Mutual Funds - Equity      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage  
Maximum | Equity Funds      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage 85.00% 85.00%  
Maximum | North Country Funds - Fixed Income      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage    
Maximum | Other Mutual Funds - Fixed Income      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage  
Maximum | Fixed Income Funds      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage 30.00% 30.00%  
Maximum | Alternative ETF      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Target Allocation, Percentage 20.00% 20.00%  
Subsequent to January 1, 2003      
Defined Benefit Plan Disclosure [Line Items]      
Service credits, percent of eligible salaries 6.00%    
Prior to January 1, 2003 | Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Service credits, percent of eligible salaries 6.00%    
Prior to January 1, 2003 | Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Service credits, percent of eligible salaries 12.00%