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Retirement Benefit Plans (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2021 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | 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 |
Defined benefit plan, unamortized net loss |  |  |  | $ 7,200 |
Defined benefit plan, benefit obligation from lump sum payment to total benefit obligation ratio (in percent) |  |  |  | 8.06% |
Defined benefit plan, net periodic benefit cost, loss due to settlement |  |  |  | $ 577 |
Defined Benefit Plan Funded Status |  |  |  |  |
Fair Value of Plan Assets |  | $ 63,893 | $ 59,199 |  |
Change in Fair Value of Plan Assets |  |  |  |  |
Fair Value of Plan Assets, Beginning of Period |  | 59,199 |  |  |
Fair Value of Plan Assets, End of Period |  | $ 63,893 | $ 59,199 |  |
Net Periodic Benefit Cost |  |  |  |  |
Settlement Cost |  |  |  | $ 577 |
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 |  | $ 63,893 | $ 59,199 |  |
Percent of Total |  | 100.00% | 100.00% |  |
Expected Future Benefit Payments |  |  |  |  |
Health Care Cost Trend Rate Assumed for Next Year |  | 7.75% | 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 |  | $ 63,893 | $ 59,199 |  |
Change in Fair Value of Plan Assets |  |  |  |  |
Fair Value of Plan Assets, Beginning of Period |  | 59,199 |  |  |
Fair Value of Plan Assets, End of Period |  | 63,893 | 59,199 |  |
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |  |  |
Fair Value of Plan Assets |  | 63,893 | 59,199 |  |
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 |  |  |
Change in Fair Value of Plan Assets |  |  |  |  |
Fair Value of Plan Assets, Beginning of Period |  |  |  |  |
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 |  |  |
Percent of Total |  | 0.00% |  |  |
Cash | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |
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 |  |  |  |  |
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 |  |  |
Cash | 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 |  |  |  |  |
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 |  |  |
Cash | 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 |  |  |  |  |
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 |  |  |
Interest-Bearing Money Market Fund |  |  |  |  |
Defined Benefit Plan Funded Status |  |  |  |  |
Fair Value of Plan Assets |  | 2,699 | 1,257 |  |
Change in Fair Value of Plan Assets |  |  |  |  |
Fair Value of Plan Assets, Beginning of Period |  | 1,257 |  |  |
Fair Value of Plan Assets, End of Period |  | 2,699 | 1,257 |  |
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |  |  |
Fair Value of Plan Assets |  | $ 2,699 | $ 1,257 |  |
Percent of Total |  | 4.20% | 2.10% |  |
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 |  | $ 2,699 | $ 1,257 |  |
Change in Fair Value of Plan Assets |  |  |  |  |
Fair Value of Plan Assets, Beginning of Period |  | 1,257 |  |  |
Fair Value of Plan Assets, End of Period |  | 2,699 | 1,257 |  |
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |  |  |
Fair Value of Plan Assets |  | 2,699 | 1,257 |  |
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 |  | 5,593 | 5,443 |  |
Change in Fair Value of Plan Assets |  |  |  |  |
Fair Value of Plan Assets, Beginning of Period |  | 5,443 |  |  |
Fair Value of Plan Assets, End of Period |  | 5,593 | 5,443 |  |
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |  |  |
Fair Value of Plan Assets |  | $ 5,593 | $ 5,443 |  |
Percent of Total |  | 8.80% | 9.20% |  |
Common Stock | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Defined Benefit Plan Funded Status |  |  |  |  |
Fair Value of Plan Assets |  | $ 5,593 | $ 5,443 |  |
Change in Fair Value of Plan Assets |  |  |  |  |
Fair Value of Plan Assets, Beginning of Period |  | 5,443 |  |  |
Fair Value of Plan Assets, End of Period |  | 5,593 | 5,443 |  |
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |  |  |
Fair Value of Plan Assets |  | 5,593 | 5,443 |  |
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 |  | 18,740 | 20,012 |  |
Change in Fair Value of Plan Assets |  |  |  |  |
Fair Value of Plan Assets, Beginning of Period |  | 20,012 |  |  |
Fair Value of Plan Assets, End of Period |  | 18,740 | 20,012 |  |
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |  |  |
Fair Value of Plan Assets |  | $ 18,740 | $ 20,012 |  |
Percent of Total |  | 29.30% | 33.80% |  |
North Country Funds - Equity | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Defined Benefit Plan Funded Status |  |  |  |  |
Fair Value of Plan Assets |  | $ 18,740 | $ 20,012 |  |
Change in Fair Value of Plan Assets |  |  |  |  |
Fair Value of Plan Assets, Beginning of Period |  | 20,012 |  |  |
Fair Value of Plan Assets, End of Period |  | 18,740 | 20,012 |  |
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |  |  |
Fair Value of Plan Assets |  | 18,740 | 20,012 |  |
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 |  | 26,598 | 19,883 |  |
Change in Fair Value of Plan Assets |  |  |  |  |
Fair Value of Plan Assets, Beginning of Period |  | 19,883 |  |  |
Fair Value of Plan Assets, End of Period |  | 26,598 | 19,883 |  |
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |  |  |
Fair Value of Plan Assets |  | $ 26,598 | $ 19,883 |  |
Percent of Total |  | 41.60% | 33.60% |  |
Other Mutual Funds - Equity | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Defined Benefit Plan Funded Status |  |  |  |  |
Fair Value of Plan Assets |  | $ 26,598 | $ 19,883 |  |
Change in Fair Value of Plan Assets |  |  |  |  |
Fair Value of Plan Assets, Beginning of Period |  | 19,883 |  |  |
Fair Value of Plan Assets, End of Period |  | 26,598 | 19,883 |  |
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |  |  |
Fair Value of Plan Assets |  | 26,598 | 19,883 |  |
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 |  | 45,338 | 39,895 |  |
Change in Fair Value of Plan Assets |  |  |  |  |
Fair Value of Plan Assets, Beginning of Period |  | 39,895 |  |  |
Fair Value of Plan Assets, End of Period |  | 45,338 | 39,895 |  |
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |  |  |
Fair Value of Plan Assets |  | $ 45,338 | $ 39,895 |  |
Percent of Total |  | 70.90% | 67.40% |  |
Equity Funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Defined Benefit Plan Funded Status |  |  |  |  |
Fair Value of Plan Assets |  | $ 45,338 | $ 39,895 |  |
Change in Fair Value of Plan Assets |  |  |  |  |
Fair Value of Plan Assets, Beginning of Period |  | 39,895 |  |  |
Fair Value of Plan Assets, End of Period |  | 45,338 | 39,895 |  |
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |  |  |
Fair Value of Plan Assets |  | 45,338 | 39,895 |  |
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 |  | 10,263 | 12,012 |  |
Change in Fair Value of Plan Assets |  |  |  |  |
Fair Value of Plan Assets, Beginning of Period |  | 12,012 |  |  |
Fair Value of Plan Assets, End of Period |  | 10,263 | 12,012 |  |
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |  |  |
Fair Value of Plan Assets |  | $ 10,263 | $ 12,012 |  |
Percent of Total |  | 16.10% | 20.30% |  |
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 |  | $ 10,263 | $ 12,012 |  |
Change in Fair Value of Plan Assets |  |  |  |  |
Fair Value of Plan Assets, Beginning of Period |  | 12,012 |  |  |
Fair Value of Plan Assets, End of Period |  | 10,263 | 12,012 |  |
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |  |  |
Fair Value of Plan Assets |  | 10,263 | 12,012 |  |
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 | 12,012 |  |
Change in Fair Value of Plan Assets |  |  |  |  |
Fair Value of Plan Assets, Beginning of Period |  | 12,012 |  |  |
Fair Value of Plan Assets, End of Period |  | 10,263 | 12,012 |  |
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |  |  |
Fair Value of Plan Assets |  | $ 10,263 | $ 12,012 |  |
Percent of Total |  | 16.10% | 20.30% |  |
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 | $ 12,012 |  |
Change in Fair Value of Plan Assets |  |  |  |  |
Fair Value of Plan Assets, Beginning of Period |  | 12,012 |  |  |
Fair Value of Plan Assets, End of Period |  | 10,263 | 12,012 |  |
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |  |  |
Fair Value of Plan Assets |  | 10,263 | 12,012 |  |
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 |  |  | 592 |  |
Change in Fair Value of Plan Assets |  |  |  |  |
Fair Value of Plan Assets, Beginning of Period |  | 592 |  |  |
Fair Value of Plan Assets, End of Period |  |  | 592 |  |
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |  |  |
Fair Value of Plan Assets |  |  | $ 592 |  |
Percent of Total |  |  | 1.00% |  |
Alternative ETF | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Defined Benefit Plan Funded Status |  |  |  |  |
Fair Value of Plan Assets |  |  | $ 592 |  |
Change in Fair Value of Plan Assets |  |  |  |  |
Fair Value of Plan Assets, Beginning of Period |  | 592 |  |  |
Fair Value of Plan Assets, End of Period |  |  | 592 |  |
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |  |  |
Fair Value of Plan Assets |  |  | 592 |  |
Alternative ETF | 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 |  |
Alternative ETF | 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 Disclosure [Line Items] |  |  |  |  |
Assumptions used calculating benefit obligation, interest rate to annuitize cash balance account |  | 4.66% |  |  |
Defined benefit plan, increase in benefit payable (in percent) |  |  |  |  | 3.00%
Defined benefit plan, benefit obligation, increase (decrease) for plan amendment |  |  | $ 526 |  | $ 352
Defined benefit plan, amortization of service cost (in years) |  |  | 7 years 7 months 20 days |  | 9 years 8 months 12 days
Defined benefit plan, benefit obligation, period increase (decrease) |  |  | $ 526 |  |
Defined benefit plan, net periodic benefit cost, loss due to settlement |  |  |  | $ 577 |
Defined Benefit Plan Funded Status |  |  |  |  |
Fair Value of Plan Assets |  | $ 63,893 | 59,199 | 54,300 |
Benefit Obligation |  | 39,763 | 42,914 | 39,528 |
Funded Status of Plan |  | 24,130 | 16,285 |  |
Change in Benefit Obligation |  |  |  |  |
Benefit Obligation, Beginning of Period |  | 42,914 | 39,528 |  |
Service Cost |  | 1,692 | 1,593 | 1,877 |
Interest Cost |  | 2,242 | 2,099 | 1,439 |
Plan Participants' Contributions |  | 0 | 0 |  |
Amendments / Curtailments / Special Termination |  | 441 |  |  |
Actuarial Gain (Loss) |  | (3,256) | 2,125 |  |
Benefits Paid |  | (4,270) | (2,957) |  |
Benefit Obligation, End of Period |  | 39,763 | 42,914 | 39,528 |
Change in Fair Value of Plan Assets |  |  |  |  |
Fair Value of Plan Assets, Beginning of Period |  | 59,199 | 54,300 |  |
Actual Return on Plan Assets |  | 8,964 | 7,856 |  |
Employer Contributions |  | 0 | 0 |  |
Plan Participants' Contributions |  | 0 | 0 |  |
Benefits Paid |  | (4,270) | (2,957) |  |
Fair Value of Plan Assets, End of Period |  | 63,893 | 59,199 | 54,300 |
Accumulated Benefit Obligation at December 31, 2024 |  | 39,763 |  |  |
Amounts Recognized in the Consolidated Balance Sheets |  |  |  |  |
Prepaid Pension Asset |  | 24,130 | 16,285 |  |
Accrued Benefit Liability |  | 0 | 0 |  |
Net Benefit (Expense) Recognized |  | 24,130 | 16,285 |  |
Amounts Recognized in Other Comprehensive (Loss) Income |  |  |  |  |
Net Unamortized Gain Arising During the Period |  | (8,509) | (2,315) | 9,492 |
Prior Service Cost |  | 441 | 526 |  |
Amortization of Net (Loss) Gain |  | 0 | (118) | 0 |
Amortization of Prior Service Cost |  | (131) | (62) | (78) |
Settlement Cost |  |  |  | (577) |
Total Other Comprehensive Loss for Pension and Other Postretirement Benefit Plans |  | (8,199) | (1,969) | 8,837 |
Accumulated Other Comprehensive Income |  |  |  |  |
Net Actuarial Loss (Gain) |  | (4,369) | 4,141 |  |
Prior Service Cost |  | 1,150 | 840 |  |
Total Accumulated Other Comprehensive (Loss) Income, Before Tax |  | (3,219) | 4,981 |  |
Net Periodic Benefit Cost |  |  |  |  |
Service Cost |  | 1,692 | 1,593 | 1,877 |
Interest Cost |  | 2,242 | 2,099 | 1,439 |
Expected Return on Plan Assets |  | (3,710) | (3,416) | (4,314) |
Amortization of Prior Service Cost |  | 131 | 62 | 77 |
Amortization of Net Loss (Gain) |  | 0 | 118 | 0 |
Settlement Cost |  |  |  | 577 |
Net Periodic Benefit Cost |  | $ 355 | $ 456 | $ (344) |
Weighted-Average Assumptions Used in Calculating Benefit Obligation |  |  |  |  |
Discount Rate |  | 6.15% | 5.52% |  |
Rate of Compensation Increase |  | 4.00% | 4.00% |  |
Interest Rate Credit for Determining Projected Cash Balance Account |  | 4.54% | 4.66% |  |
Interest Rate Credit for Determining Projected Cash Balance Account, Segment One |  | 4.66% |  |  |
Interest Rate Credit for Determining Projected Cash Balance Account, Segment Two |  | 5.25% |  |  |
Interest Rate Credit for Determining Projected Cash Balance Account, Segment Three |  | 5.57% |  |  |
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment One |  | 4.66% |  |  |
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Two |  | 5.25% |  |  |
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Three |  | 5.57% |  |  |
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |  |  |
Discount Rate |  | 5.52% | 5.59% | 3.30% |
Expected Long-Term Return on Plan Assets |  | 6.50% | 6.50% | 6.50% |
Rate of Compensation Increase |  | 4.00% | 3.50% | 3.50% |
Interest Rate Credit for Determining Projected Cash Balance Account |  | 4.66% | 3.99% | 3.00% |
Interest Rate to Annuitize Cash Balance Account, Segment One |  | 4.66% | 5.50% | 5.09% |
Interest Rate to Annuitize Cash Balance Account, Segment Two |  | 5.25% | 5.76% | 5.60% |
Interest Rate to Annuitize Cash Balance Account, Segment Three |  | 5.57% | 5.83% | 5.41% |
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment One |  | 4.66% | 5.50% | 5.09% |
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Two |  | 5.25% | 5.76% | 5.60% |
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Three |  | 5.57% | 5.83% | 5.41% |
Fair Value of Plan Assets |  | $ 63,893 | $ 59,199 | $ 54,300 |
Expected Future Benefit Payments |  |  |  |  |
2025 |  | 3,679 |  |  |
2026 |  | 3,037 |  |  |
2027 |  | 3,293 |  |  |
2028 |  | 3,294 |  |  |
2029 |  | 3,129 |  |  |
2030 - 2034 |  | 16,966 |  |  |
Estimated Contributions During 2025 |  | $ 0 |  |  |
Select Executive Retirement Plan |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Assumptions used calculating benefit obligation, interest rate to annuitize cash balance account |  | 5.25% |  |  |
Defined benefit plan, benefit obligation, increase (decrease) for plan amendment |  |  | 0 |  |
Defined benefit plan, amortization of service cost (in years) | 12 years 6 months | 7 years 7 months 20 days |  |  |
Defined benefit plan, benefit obligation, period increase (decrease) | $ 123 | $ 441 |  |  |
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 |  | 4,940 | 6,904 | 6,070 |
Funded Status of Plan |  | (4,940) | (6,904) |  |
Change in Benefit Obligation |  |  |  |  |
Benefit Obligation, Beginning of Period |  | 6,904 | 6,070 |  |
Service Cost |  | 78 | 570 | 835 |
Interest Cost |  | 320 | 336 | 225 |
Plan Participants' Contributions |  | 0 | 0 |  |
Amendments / Curtailments / Special Termination |  | 0 |  |  |
Actuarial Gain (Loss) |  | (1,770) | 357 |  |
Benefits Paid |  | (592) | (429) |  |
Benefit Obligation, End of Period |  | 4,940 | 6,904 | 6,070 |
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 |  | 592 | 429 |  |
Plan Participants' Contributions |  | 0 | 0 |  |
Benefits Paid |  | (592) | (429) |  |
Fair Value of Plan Assets, End of Period |  | 0 | 0 | 0 |
Accumulated Benefit Obligation at December 31, 2024 |  | 4,940 |  |  |
Amounts Recognized in the Consolidated Balance Sheets |  |  |  |  |
Prepaid Pension Asset |  | 0 | 0 |  |
Accrued Benefit Liability |  | (4,940) | (6,904) |  |
Net Benefit (Expense) Recognized |  | (4,940) | (6,904) |  |
Amounts Recognized in Other Comprehensive (Loss) Income |  |  |  |  |
Net Unamortized Gain Arising During the Period |  | (1,770) | 358 | (983) |
Prior Service Cost |  | 0 | 0 |  |
Amortization of Net (Loss) Gain |  | (24) | (73) | (212) |
Amortization of Prior Service Cost |  | (39) | (39) | (44) |
Settlement Cost |  |  |  | 0 |
Total Other Comprehensive Loss for Pension and Other Postretirement Benefit Plans |  | (1,833) | 246 | (1,239) |
Accumulated Other Comprehensive Income |  |  |  |  |
Net Actuarial Loss (Gain) |  | (55) | 1,739 |  |
Prior Service Cost |  | 291 | 330 |  |
Total Accumulated Other Comprehensive (Loss) Income, Before Tax |  | 236 | 2,069 |  |
Net Periodic Benefit Cost |  |  |  |  |
Service Cost |  | 78 | 570 | 835 |
Interest Cost |  | 320 | 336 | 225 |
Expected Return on Plan Assets |  | 0 | 0 | 0 |
Amortization of Prior Service Cost |  | 39 | 39 | 44 |
Amortization of Net Loss (Gain) |  | 25 | 73 | 212 |
Settlement Cost |  |  |  | 0 |
Net Periodic Benefit Cost |  | $ 462 | $ 1,018 | $ 1,316 |
Weighted-Average Assumptions Used in Calculating Benefit Obligation |  |  |  |  |
Discount Rate |  | 6.21% | 5.53% |  |
Rate of Compensation Increase |  | 4.00% | 4.00% |  |
Interest Rate Credit for Determining Projected Cash Balance Account |  | 4.54% | 4.66% |  |
Interest Rate Credit for Determining Projected Cash Balance Account, Segment One |  | 4.66% |  |  |
Interest Rate Credit for Determining Projected Cash Balance Account, Segment Two |  | 5.25% |  |  |
Interest Rate Credit for Determining Projected Cash Balance Account, Segment Three |  | 5.57% |  |  |
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment One |  | 4.66% |  |  |
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Two |  | 5.25% |  |  |
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Three |  | 5.57% |  |  |
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |  |  |
Discount Rate |  | 5.53% | 5.61% | 5.61% |
Rate of Compensation Increase |  | 4.00% | 3.50% | 3.50% |
Interest Rate Credit for Determining Projected Cash Balance Account |  | 4.66% | 3.99% | 3.99% |
Interest Rate to Annuitize Cash Balance Account, Segment One |  | 4.66% | 5.50% | 5.09% |
Interest Rate to Annuitize Cash Balance Account, Segment Two |  | 5.25% | 5.76% | 5.60% |
Interest Rate to Annuitize Cash Balance Account, Segment Three |  | 5.57% | 5.83% | 5.41% |
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment One |  | 4.66% | 5.50% | 5.09% |
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Two |  | 5.25% | 5.76% | 5.60% |
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts, Segment Three |  | 5.57% | 5.76% | 5.41% |
Fair Value of Plan Assets |  | $ 0 | $ 0 | $ 0 |
Expected Future Benefit Payments |  |  |  |  |
2025 |  | 579 |  |  |
2026 |  | 549 |  |  |
2027 |  | 531 |  |  |
2028 |  | 501 |  |  |
2029 |  | 471 |  |  |
2030 - 2034 |  | 1,992 |  |  |
Estimated Contributions During 2025 |  | $ 579 |  |  |
Postretirement Benefit Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Assumptions used calculating benefit obligation, interest rate to annuitize cash balance account |  | 5.57% |  |  |
Defined benefit plan, benefit obligation, increase (decrease) for plan amendment |  |  | 0 |  |
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 |  | 5,550 | 6,221 | 6,482 |
Funded Status of Plan |  | (5,550) | (6,221) |  |
Change in Benefit Obligation |  |  |  |  |
Benefit Obligation, Beginning of Period |  | 6,221 | 6,482 |  |
Service Cost |  | 45 | 56 | 90 |
Interest Cost |  | 320 | 332 | 248 |
Plan Participants' Contributions |  | 483 | 459 |  |
Amendments / Curtailments / Special Termination |  | 0 |  |  |
Actuarial Gain (Loss) |  | (497) | (397) |  |
Benefits Paid |  | (1,022) | (711) |  |
Benefit Obligation, End of Period |  | 5,550 | 6,221 | 6,482 |
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 |  | 539 | 252 |  |
Plan Participants' Contributions |  | 483 | 459 |  |
Benefits Paid |  | (1,022) | (711) |  |
Fair Value of Plan Assets, End of Period |  | 0 | 0 | 0 |
Accumulated Benefit Obligation at December 31, 2024 |  | 5,550 |  |  |
Amounts Recognized in the Consolidated Balance Sheets |  |  |  |  |
Prepaid Pension Asset |  | 0 | 0 |  |
Accrued Benefit Liability |  | (5,550) | (6,221) |  |
Net Benefit (Expense) Recognized |  | (5,550) | (6,221) |  |
Amounts Recognized in Other Comprehensive (Loss) Income |  |  |  |  |
Net Unamortized Gain Arising During the Period |  | (498) | (397) | (1,571) |
Prior Service Cost |  | 0 | 0 |  |
Amortization of Net (Loss) Gain |  | 337 | 353 | 156 |
Amortization of Prior Service Cost |  | (102) | (104) | (106) |
Settlement Cost |  |  |  | 0 |
Total Other Comprehensive Loss for Pension and Other Postretirement Benefit Plans |  | (263) | (148) | (1,521) |
Accumulated Other Comprehensive Income |  |  |  |  |
Net Actuarial Loss (Gain) |  | (2,801) | (2,641) |  |
Prior Service Cost |  | 160 | 262 |  |
Total Accumulated Other Comprehensive (Loss) Income, Before Tax |  | (2,641) | (2,379) |  |
Net Periodic Benefit Cost |  |  |  |  |
Service Cost |  | 45 | 56 | 90 |
Interest Cost |  | 320 | 332 | 248 |
Expected Return on Plan Assets |  | 0 | 0 | 0 |
Amortization of Prior Service Cost |  | 102 | 104 | 106 |
Amortization of Net Loss (Gain) |  | (337) | (353) | (156) |
Settlement Cost |  |  |  | 0 |
Net Periodic Benefit Cost |  | $ 130 | $ 139 | $ 288 |
Weighted-Average Assumptions Used in Calculating Benefit Obligation |  |  |  |  |
Discount Rate |  | 6.12% | 5.51% |  |
Rate of Compensation Increase |  | 4.00% | 4.00% |  |
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |  |  |
Discount Rate |  | 5.51% | 5.62% | 3.32% |
Rate of Compensation Increase |  | 4.00% | 3.50% | 3.50% |
Fair Value of Plan Assets |  | $ 0 | $ 0 | $ 0 |
Expected Future Benefit Payments |  |  |  |  |
2025 |  | 642 |  |  |
2026 |  | 657 |  |  |
2027 |  | 662 |  |  |
2028 |  | 628 |  |  |
2029 |  | 615 |  |  |
2030 - 2034 |  | 2,520 |  |  |
Estimated Contributions During 2025 |  | $ 642 |  |  |
Minimum | Cash |  |  |  |  |
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |  |  |
Target Allocation, Percentage |  | 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 | 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% |  |
Maximum | Cash |  |  |  |  |
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |  |  |
Target Allocation, Percentage |  | 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 | 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% |  |
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% |  |  |

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