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Retirement Benefit Plans (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
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 Funded Status      
Fair Value of Plan Assets $ 68,925,000 $ 59,837,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 59,837,000    
Fair Value of Plan Assets, End of Period 68,925,000 59,837,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 68,925,000 $ 59,837,000  
Percent of Total 100.00% 100.00%  
Expected Future Benefit Payments      
Health Care Cost Trend   Rate Assumed for Next Year 7.00% 7.00%  
Rate to which the Cost Trend   Rate is Assumed to Decline   (the Ultimate Trend Rate) 3.78% 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 $ 68,925,000 $ 59,837,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 59,837,000    
Fair Value of Plan Assets, End of Period 68,925,000 59,837,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 68,925,000 59,837,000  
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 2,439,000 1,124,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 1,124,000    
Fair Value of Plan Assets, End of Period 2,439,000 1,124,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 2,439,000 $ 1,124,000  
Percent of Total 3.50% 1.90%  
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 $ 2,439,000 $ 1,124,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 1,124,000    
Fair Value of Plan Assets, End of Period 2,439,000 1,124,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 2,439,000 1,124,000  
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 6,469,000 5,332,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 5,332,000    
Fair Value of Plan Assets, End of Period 6,469,000 5,332,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 6,469,000 $ 5,332,000  
Percent of Total 9.40% 8.90%  
Common Stock | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets $ 6,469,000 $ 5,332,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 5,332,000    
Fair Value of Plan Assets, End of Period 6,469,000 5,332,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 6,469,000 5,332,000  
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 29,490,000 25,741,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 25,741,000    
Fair Value of Plan Assets, End of Period 29,490,000 25,741,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 29,490,000 $ 25,741,000  
Percent of Total 42.80% 43.00%  
North Country Funds - Equity | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets $ 29,490,000 $ 25,741,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 25,741,000    
Fair Value of Plan Assets, End of Period 29,490,000 25,741,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 29,490,000 25,741,000  
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 16,761,000 17,336,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 17,336,000    
Fair Value of Plan Assets, End of Period 16,761,000 17,336,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 16,761,000 $ 17,336,000  
Percent of Total 24.30% 29.00%  
Other Mutual Funds - Equity | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets $ 16,761,000 $ 17,336,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 17,336,000    
Fair Value of Plan Assets, End of Period 16,761,000 17,336,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 16,761,000 17,336,000  
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 46,251,000 43,077,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 43,077,000    
Fair Value of Plan Assets, End of Period 46,251,000 43,077,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 46,251,000 $ 43,077,000  
Percent of Total 67.10% 72.00%  
Equity Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets $ 46,251,000 $ 43,077,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 43,077,000    
Fair Value of Plan Assets, End of Period 46,251,000 43,077,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 46,251,000 43,077,000  
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 8,534,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 8,534,000    
Fair Value of Plan Assets, End of Period 6,317,000 8,534,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 6,317,000 $ 8,534,000  
Percent of Total 9.20% 14.30%  
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 $ 8,534,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 8,534,000    
Fair Value of Plan Assets, End of Period 6,317,000 8,534,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 6,317,000 8,534,000  
North Country 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  
North Country 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  
Other Mutual Funds - Fixed Income      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 2,675,000 805,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 805,000    
Fair Value of Plan Assets, End of Period 2,675,000 805,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 2,675,000 $ 805,000  
Percent of Total 3.90% 1.30%  
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 $ 2,675,000 $ 805,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 805,000    
Fair Value of Plan Assets, End of Period 2,675,000 805,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 2,675,000 805,000  
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 8,992,000 9,339,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 9,339,000    
Fair Value of Plan Assets, End of Period 8,992,000 9,339,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 8,992,000 $ 9,339,000  
Percent of Total 13.10% 15.60%  
Fixed Income Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets $ 8,992,000 $ 9,339,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 9,339,000    
Fair Value of Plan Assets, End of Period 8,992,000 9,339,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 8,992,000 9,339,000  
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 4,774,000 965,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 965,000    
Fair Value of Plan Assets, End of Period 4,774,000 965,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets $ 4,774,000 $ 965,000  
Percent of Total 6.90% 1.60%  
Alternative ETF | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets $ 4,774,000 $ 965,000  
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 965,000    
Fair Value of Plan Assets, End of Period 4,774,000 965,000  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Fair Value of Plan Assets 4,774,000 965,000  
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 1.02%    
Defined benefit plan, increase in benefit payable, percent 3.00%    
Defined benefit plan, benefit obligation, increase (decrease) for plan amendment $ 0 351,638  
Defined benefit plan, amortization of service cost 9 years 8 months 12 days    
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets $ 68,925,000 59,837,000 $ 57,051,000
Benefit Obligation 45,659,000 44,877,000 42,322,000
Funded Status of Plan 23,266,000 14,960,000  
Change in Benefit Obligation      
Benefit Obligation, Beginning of Period 44,877,000 42,322,000  
Service Cost 1,934,000 1,663,000 1,527,000
Interest Cost 1,365,000 1,544,000 1,765,000
Plan Participants' Contributions 0 0  
Amendments 0 351,638  
Actuarial (Gain) Loss (347,000) 2,901,000  
Benefits Paid (2,170,000) (3,905,000)  
Benefit Obligation, End of Period 45,659,000 44,877,000 42,322,000
Change in Fair Value of Plan Assets      
Fair Value of Plan Assets, Beginning of Period 59,837,000 57,051,000  
Actual Return on Plan Assets 11,258,000 6,691,000  
Employer Contributions 0 0  
Plan Participants' Contributions 0 0  
Benefits Paid (2,170,000) (3,905,000)  
Fair Value of Plan Assets, End of Period 68,925,000 59,837,000 57,051,000
Accumulated Benefit Obligation at December 31, 2021 45,482,000    
Amounts Recognized in the Consolidated Balance Sheets      
Prepaid Pension Asset 23,266,000 14,960,000  
Accrued Benefit Liability 0 0  
Net Benefit (Expense) Recognized 23,266,000 14,960,000  
Amounts Recognized in Other Comprehensive Income (Loss)      
Net Unamortized (Gain) Loss Arising During the Period (7,826,000) (182,000) (4,584,000)
Net Prior Service Cost Arising During the Period   349,000  
Amortization of Net (Loss) Gain 0 (81,000) (613,000)
Amortization of Prior Service Cost (78,000) (63,000) (69,000)
Total Other Comprehensive (Loss) Income for Pension and Other Postretirement Benefit Plans (7,904,000) 23,000 (5,266,000)
Accumulated Other Comprehensive Income      
Net Actuarial (Gain) Loss (2,341,000) 5,482,000  
Prior Service Cost 453,000 533,000  
Total Accumulated Other Comprehensive (Loss) Income, Before Tax (1,888,000) 6,015,000  
Amounts that will be Amortized from Accumulated Other Comprehensive Income the Next Year      
Net Actuarial Loss (Gain) 0    
Prior Service Cost 77,000    
Net Periodic Benefit Cost      
Service Cost 1,934,000 1,663,000 1,527,000
Interest Cost 1,365,000 1,544,000 1,765,000
Expected Return on Plan Assets (3,780,000) (3,608,000) (3,060,000)
Amortization of Prior Service Cost 78,000 63,000 69,000
Amortization of Net Loss (Gain) 0 81,000 613,000
Net Periodic Benefit Cost $ (403,000) $ (257,000) $ 914,000
Weighted-Average Assumptions Used in Calculating Benefit Obligation      
Discount Rate 3.30% 3.14%  
Rate of Compensation Increase 3.50% 3.50%  
Interest Rate Credit for Determining Projected Cash Balance Account 3.00% 3.00%  
Interest Rate Credit for Determining Projected Cash Balance Account, Segment One 1.02%    
Interest Rate Credit for Determining Projected Cash Balance Account, Segment Two 2.72%    
Interest Rate Credit for Determining Projected Cash Balance Account, Segment Three 3.08%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment One 1.02%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Two 2.72%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Three 3.08%    
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Discount Rate 3.14% 3.72% 4.81%
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 1.02%    
Interest Rate to Annuitize Cash Balance Account, Segment Two 2.72%    
Interest Rate to Annuitize Cash Balance Account, Segment Three 3.08%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment One 1.02%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Two 2.72%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Three 3.08%    
Fair Value of Plan Assets $ 68,925,000 $ 59,837,000 $ 57,051,000
Expected Future Benefit Payments      
2022 2,666,000    
2023 3,329,000    
2024 3,106,000    
2025 3,474,000    
2026 2,699,000    
2027 - 2031 15,040,000    
Estimated Contributions During 2022 $ 0    
Select Executive Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Assumptions used calculating benefit obligation, interest rate to annuitize cash balance account 2.72%    
Defined benefit plan, benefit obligation, increase (decrease) for plan amendment $ 0 122,000  
Defined benefit plan, amortization of service cost 12 years 6 months    
Defined benefit plan, benefit obligation, period increase (decrease) $ 122,797    
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 0 0 0
Benefit Obligation 6,455,000 5,820,000 5,194,000
Funded Status of Plan (6,455,000) (5,820,000)  
Change in Benefit Obligation      
Benefit Obligation, Beginning of Period 5,820,000 5,194,000  
Service Cost 582,000 408,000 324,000
Interest Cost 191,000 192,000 217,000
Plan Participants' Contributions 0 0  
Amendments 0 122,000  
Actuarial (Gain) Loss 332,000 369,000  
Benefits Paid (470,000) (465,000)  
Benefit Obligation, End of Period 6,455,000 5,820,000 5,194,000
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 470,000 465,000  
Plan Participants' Contributions 0 0  
Benefits Paid (470,000) (465,000)  
Fair Value of Plan Assets, End of Period 0 0 0
Accumulated Benefit Obligation at December 31, 2021 6,384,000    
Amounts Recognized in the Consolidated Balance Sheets      
Prepaid Pension Asset 0 0  
Accrued Benefit Liability (6,455,000) (5,820,000)  
Net Benefit (Expense) Recognized (6,455,000) (5,820,000)  
Amounts Recognized in Other Comprehensive Income (Loss)      
Net Unamortized (Gain) Loss Arising During the Period 332,000 368,000 409,000
Net Prior Service Cost Arising During the Period   123,000  
Amortization of Net (Loss) Gain (178,000) (146,000) (113,000)
Amortization of Prior Service Cost (48,000) (42,000) (54,000)
Total Other Comprehensive (Loss) Income for Pension and Other Postretirement Benefit Plans 106,000 303,000 242,000
Accumulated Other Comprehensive Income      
Net Actuarial (Gain) Loss 2,651,000 2,497,000  
Prior Service Cost 411,000 459,000  
Total Accumulated Other Comprehensive (Loss) Income, Before Tax 3,062,000 2,956,000  
Amounts that will be Amortized from Accumulated Other Comprehensive Income the Next Year      
Net Actuarial Loss (Gain) 157,000    
Prior Service Cost 44,000    
Net Periodic Benefit Cost      
Service Cost 582,000 408,000 324,000
Interest Cost 191,000 192,000 217,000
Expected Return on Plan Assets 0 0 0
Amortization of Prior Service Cost 48,000 42,000 54,000
Amortization of Net Loss (Gain) 179,000 146,000 113,000
Net Periodic Benefit Cost $ 1,000,000 $ 788,000 $ 708,000
Weighted-Average Assumptions Used in Calculating Benefit Obligation      
Discount Rate 3.29% 3.19%  
Rate of Compensation Increase 3.50% 3.50%  
Interest Rate Credit for Determining Projected Cash Balance Account 3.00% 3.00%  
Interest Rate Credit for Determining Projected Cash Balance Account, Segment One 1.02%    
Interest Rate Credit for Determining Projected Cash Balance Account, Segment Two 2.72%    
Interest Rate Credit for Determining Projected Cash Balance Account, Segment Three 3.08%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment One 1.02%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Two 2.72%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Three 3.08%    
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Discount Rate 3.19% 3.75% 4.80%
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 1.02%    
Interest Rate to Annuitize Cash Balance Account, Segment Two 2.72%    
Interest Rate to Annuitize Cash Balance Account, Segment Three 3.08%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment One 1.02%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Two 2.72%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Three 3.08%    
Fair Value of Plan Assets $ 0 $ 0 $ 0
Expected Future Benefit Payments      
2022 445,000    
2023 424,000    
2024 630,000    
2025 609,000    
2026 582,000    
2027 - 2031 2,605,000    
Estimated Contributions During 2022 $ 445,000    
Postretirement Benefit Plans      
Defined Benefit Plan Disclosure [Line Items]      
Assumptions used calculating benefit obligation, interest rate to annuitize cash balance account 3.08%    
Defined benefit plan, benefit obligation, increase (decrease) for plan amendment $ 0 0  
Defined Benefit Plan Funded Status      
Fair Value of Plan Assets 0 0 0
Benefit Obligation 7,994,000 9,028,000 8,652,000
Funded Status of Plan (7,994,000) (9,028,000)  
Change in Benefit Obligation      
Benefit Obligation, Beginning of Period 9,028,000 8,652,000  
Service Cost 109,000 123,000 121,000
Interest Cost 249,000 310,000 364,000
Plan Participants' Contributions 432,000 454,000  
Amendments 0 0  
Actuarial (Gain) Loss (1,240,000) 151,000  
Benefits Paid (584,000) (662,000)  
Benefit Obligation, End of Period 7,994,000 9,028,000 8,652,000
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 152,000 208,000  
Plan Participants' Contributions 432,000 454,000  
Benefits Paid (584,000) (662,000)  
Fair Value of Plan Assets, End of Period 0 0 0
Accumulated Benefit Obligation at December 31, 2021 7,994,000    
Amounts Recognized in the Consolidated Balance Sheets      
Prepaid Pension Asset 0 0  
Accrued Benefit Liability (7,994,000) (9,028,000)  
Net Benefit (Expense) Recognized (7,994,000) (9,028,000)  
Amounts Recognized in Other Comprehensive Income (Loss)      
Net Unamortized (Gain) Loss Arising During the Period (1,239,000) 151,000 670,000
Net Prior Service Cost Arising During the Period   0  
Amortization of Net (Loss) Gain 87,000 0 42,000
Amortization of Prior Service Cost (106,000) (106,000) (101,000)
Total Other Comprehensive (Loss) Income for Pension and Other Postretirement Benefit Plans (1,258,000) 45,000 611,000
Accumulated Other Comprehensive Income      
Net Actuarial (Gain) Loss (1,182,000) (30,000)  
Prior Service Cost 472,000 578,000  
Total Accumulated Other Comprehensive (Loss) Income, Before Tax (710,000) 548,000  
Amounts that will be Amortized from Accumulated Other Comprehensive Income the Next Year      
Net Actuarial Loss (Gain) (128,000)    
Prior Service Cost 106,000    
Net Periodic Benefit Cost      
Service Cost 109,000 123,000 121,000
Interest Cost 249,000 310,000 364,000
Expected Return on Plan Assets 0 0 0
Amortization of Prior Service Cost 106,000 106,000 101,000
Amortization of Net Loss (Gain) (88,000) 0 (42,000)
Net Periodic Benefit Cost $ 376,000 $ 539,000 $ 544,000
Weighted-Average Assumptions Used in Calculating Benefit Obligation      
Discount Rate 3.32% 3.17%  
Rate of Compensation Increase 3.50% 3.50%  
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost      
Discount Rate 3.17% 3.76% 4.81%
Rate of Compensation Increase 3.50% 3.50% 3.50%
Fair Value of Plan Assets $ 0 $ 0 $ 0
Expected Future Benefit Payments      
2022 610,000    
2023 600,000    
2024 607,000    
2025 620,000    
2026 631,000    
2027 - 2031 2,917,000    
Estimated Contributions During 2022 $ 610,000    
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%