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Retirement Benefit Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]          
Interest Credit Under Cash Balance Plan 0.03        
Employer matching contribution, percent of match, maximum 5.00%        
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets $ 57,051 $ 48,445   $ 57,051 $ 48,445
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, Beginning of Period 48,445        
Fair Value of Plan Assets, End of Period 57,051 48,445      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets $ 57,051 $ 48,445   $ 57,051 $ 48,445
Percent of Total       100.00% 100.00%
Expected Future Benefit Payments          
Health Care Cost Trend Rate Assumed for Next Year       6.75% 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      
Effect of a One Percentage Point Increase on Service and Interest Cost Components $ 43        
Effect of a One Percentage Point Decrease on Service and Interest Cost Components (36)        
Effect of a One Percentage Point Increase on Accumulated Postretirement Benefit Obligation 550        
Effect of a One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation (477)        
Quoted Prices in Active Markets for Identical Assets (Level 1)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 57,051 $ 48,445   $ 57,051 $ 48,445
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, Beginning of Period 48,445        
Fair Value of Plan Assets, End of Period 57,051 48,445      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets 57,051 48,445   57,051 48,445
Significant Other Observable Inputs (Level 2)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 0 0   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   0 0
Significant Unobservable Inputs (Level 3)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 0 0   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   0 0
Cash          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 0 0   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   $ 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   $ 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   0 0
Cash | Significant Other Observable Inputs (Level 2)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 0 0   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   0 0
Cash | Significant Unobservable Inputs (Level 3)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 0 0   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   0 0
Interest-Bearing Money Market Fund          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 2,742 3,310   2,742 3,310
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, Beginning of Period 3,310        
Fair Value of Plan Assets, End of Period 2,742 3,310      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets 2,742 3,310   $ 2,742 $ 3,310
Percent of Total       4.80% 6.80%
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 2,742 3,310   $ 2,742 $ 3,310
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, Beginning of Period 3,310        
Fair Value of Plan Assets, End of Period 2,742 3,310      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets 2,742 3,310   2,742 3,310
Interest-Bearing Money Market Fund | Significant Other Observable Inputs (Level 2)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 0 0   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   0 0
Interest-Bearing Money Market Fund | Significant Unobservable Inputs (Level 3)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 0 0   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   0 0
Common Stock          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 6,542 5,381   6,542 5,381
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, Beginning of Period 5,381        
Fair Value of Plan Assets, End of Period 6,542 5,381      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets 6,542 5,381   $ 6,542 $ 5,381
Percent of Total       11.50% [1] 11.10%
Common Stock | Quoted Prices in Active Markets for Identical Assets (Level 1)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 6,542 5,381   $ 6,542 $ 5,381
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, Beginning of Period 5,381        
Fair Value of Plan Assets, End of Period 6,542 5,381      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets 6,542 5,381   6,542 5,381
Common Stock | Significant Other Observable Inputs (Level 2)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 0 0   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   0 0
Common Stock | Significant Unobservable Inputs (Level 3)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 0 0   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   0 0
North Country Funds - Equity          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets [2] 21,209 16,629   21,209 16,629
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, Beginning of Period [2] 16,629        
Fair Value of Plan Assets, End of Period [2] 21,209 16,629      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets [2] 21,209 16,629   $ 21,209 $ 16,629
Percent of Total [2]       37.20% 34.30%
North Country Funds - Equity | Quoted Prices in Active Markets for Identical Assets (Level 1)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets [2] 21,209 16,629   $ 21,209 $ 16,629
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, Beginning of Period [2] 16,629        
Fair Value of Plan Assets, End of Period [2] 21,209 16,629      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets [2] 21,209 16,629   21,209 16,629
North Country Funds - Equity | Significant Other Observable Inputs (Level 2)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets [2] 0 0   0 0
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, Beginning of Period [2] 0        
Fair Value of Plan Assets, End of Period [2] 0 0      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets [2] 0 0   0 0
North Country Funds - Equity | Significant Unobservable Inputs (Level 3)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets [2] 0 0   0 0
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, Beginning of Period [2] 0        
Fair Value of Plan Assets, End of Period [2] 0 0      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets [2] 0 0   0 0
Other Mutual Funds - Equity          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 15,868 13,081   15,868 13,081
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, Beginning of Period 13,081        
Fair Value of Plan Assets, End of Period 15,868 13,081      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets 15,868 13,081   $ 15,868 $ 13,081
Percent of Total       27.80% 27.00%
Other Mutual Funds - Equity | Quoted Prices in Active Markets for Identical Assets (Level 1)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 15,868 13,081   $ 15,868 $ 13,081
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, Beginning of Period 13,081        
Fair Value of Plan Assets, End of Period 15,868 13,081      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets 15,868 13,081   15,868 13,081
Other Mutual Funds - Equity | Significant Other Observable Inputs (Level 2)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 0 0   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   0 0
Other Mutual Funds - Equity | Significant Unobservable Inputs (Level 3)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 0 0   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   0 0
Equity Funds          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 37,077 29,710   37,077 29,710
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, Beginning of Period 29,710        
Fair Value of Plan Assets, End of Period 37,077 29,710      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets 37,077 29,710   $ 37,077 $ 29,710
Percent of Total       65.00% 61.30%
Equity Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 37,077 29,710   $ 37,077 $ 29,710
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, Beginning of Period 29,710        
Fair Value of Plan Assets, End of Period 37,077 29,710      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets 37,077 29,710   37,077 29,710
Equity Funds | Significant Other Observable Inputs (Level 2)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 0 0   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   0 0
Equity Funds | Significant Unobservable Inputs (Level 3)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 0 0   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   0 0
North Country Funds - Fixed Income          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets [2] 8,692 8,124   8,692 8,124
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, Beginning of Period [2] 8,124        
Fair Value of Plan Assets, End of Period [2] 8,692 8,124      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets [2] 8,692 8,124   $ 8,692 $ 8,124
Percent of Total [2]       15.20% 16.80%
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 [2] 8,692 8,124   $ 8,692 $ 8,124
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, Beginning of Period [2] 8,124        
Fair Value of Plan Assets, End of Period [2] 8,692 8,124      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets [2] 8,692 8,124   8,692 8,124
North Country Funds - Fixed Income | Significant Other Observable Inputs (Level 2)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets [2] 0 0   0 0
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, Beginning of Period [2] 0        
Fair Value of Plan Assets, End of Period [2] 0 0      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets [2] 0 0   0 0
North Country Funds - Fixed Income | Significant Unobservable Inputs (Level 3)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets [2] 0 0   0 0
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, Beginning of Period [2] 0        
Fair Value of Plan Assets, End of Period [2] 0 0      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets [2] 0 0   0 0
Other Mutual Funds - Fixed Income          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 793 1,920   793 1,920
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, Beginning of Period 1,920        
Fair Value of Plan Assets, End of Period 793 1,920      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets 793 1,920   $ 793 $ 1,920
Percent of Total       1.40% 4.00%
Other Mutual Funds - Fixed Income | Quoted Prices in Active Markets for Identical Assets (Level 1)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 793 1,920   $ 793 $ 1,920
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, Beginning of Period 1,920        
Fair Value of Plan Assets, End of Period 793 1,920      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets 793 1,920   793 1,920
Other Mutual Funds - Fixed Income | Significant Other Observable Inputs (Level 2)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 0 0   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   0 0
Other Mutual Funds - Fixed Income | Significant Unobservable Inputs (Level 3)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 0 0   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   0 0
Fixed Income Funds          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 9,485 10,044   9,485 10,044
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, Beginning of Period 10,044        
Fair Value of Plan Assets, End of Period 9,485 10,044      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets 9,485 10,044   $ 9,485 $ 10,044
Percent of Total       16.60% 20.80%
Fixed Income Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 9,485 10,044   $ 9,485 $ 10,044
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, Beginning of Period 10,044        
Fair Value of Plan Assets, End of Period 9,485 10,044      
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets 9,485 10,044   9,485 10,044
Fixed Income Funds | Significant Other Observable Inputs (Level 2)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 0 0   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   0 0
Fixed Income Funds | Significant Unobservable Inputs (Level 3)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 0 0   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   0 0
Alternative ETF          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 1,205     1,205  
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, End of Period 1,205        
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets 1,205     $ 1,205  
Percent of Total       2.10%  
Alternative ETF | Quoted Prices in Active Markets for Identical Assets (Level 1)          
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 1,205     $ 1,205  
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, End of Period 1,205        
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Fair Value of Plan Assets 1,205     1,205  
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, End of Period 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, End of Period 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       2.04%  
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 57,051 48,445 $ 53,571 $ 57,051 48,445
Benefit Obligation 42,322 38,069 38,921 42,322 38,069
Funded Status of Plan       14,729 10,376
Change in Benefit Obligation          
Benefit Obligation, Beginning of Period 38,069 38,921      
Service Cost 1,527 1,557 1,392    
Interest Cost 1,765 1,598 1,682    
Plan Participants' Contributions 0 0      
Amendments   0      
Actuarial Loss 2,960 (795)      
Benefits Paid (1,999) (3,212)      
Benefit Obligation, End of Period 42,322 38,069 38,921    
Change in Fair Value of Plan Assets          
Fair Value of Plan Assets, Beginning of Period 48,445 53,571      
Actual Return on Plan Assets 10,605 (1,914)      
Employer Contributions 0 0      
Plan Participants' Contributions 0 0      
Benefits Paid (1,999) (3,212)      
Fair Value of Plan Assets, End of Period 57,051 48,445 53,571    
Accumulated Benefit Obligation at December 31, 2019       42,041  
Amounts Recognized in the Consolidated Balance Sheets          
Prepaid Pension Asset       14,729 10,376
Accrued Benefit Liability       0 0
Net Benefit Recognized       14,729 10,376
Amounts Recognized in Other Comprehensive Income (Loss)          
Net Unamortized (Gain) Loss Arising During the Period (4,584) 4,480 (517)    
Net Prior Service Cost Arising During the Period   0 0    
Amortization of Net Loss (613) (194) (306)    
Accretion of Net Retirement Plan Prior Service Credit, Tax (Expense) Benefit (69) 49 57    
Total Other Comprehensive (Loss) Income for Pension and Other Postretirement Benefit Plans (5,266) 4,335 (766)    
Accumulated Other Comprehensive Income          
Net Actuarial Loss (Gains)       5,745 10,942
Prior Service Cost       244 313
Total Accumulated Other Comprehensive Income, Before Tax       5,989 $ 11,255
Amounts that will be Amortized from Accumulated Other Comprehensive Income the Next Year          
Net Actuarial Loss       4  
Prior Service Cost       $ 63  
Net Periodic Benefit Cost          
Service Cost 1,527 1,557 1,392    
Interest Cost 1,765 1,598 1,682    
Expected Return on Plan Assets (3,060) (3,362) (3,141)    
Amortization of Prior Service (Credit) Cost 69 (49) (57)    
Amortization of Net Loss 613 194 306    
Net Periodic Benefit Cost $ 914 $ (62) $ 182    
Weighted-Average Assumptions Used in Calculating Benefit Obligation          
Discount Rate       3.72% 4.81%
Rate of Compensation Increase       3.50% 3.50%
Interest Rate Credit for Determining Projected Cash Balance Account       3.00% 3.36%
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Discount Rate 4.81% 4.24% 4.83%    
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     4.50%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts     4.50%    
Fair Value of Plan Assets $ 57,051 $ 48,445 $ 53,571 $ 57,051 $ 48,445
Expected Future Benefit Payments          
2020       2,975  
2021       2,527  
2022       2,808  
2023       3,048  
2024       2,922  
2025- 2029       14,571  
Estimated Contributions During 2020       $ 0  
Select Executive Retirement Plan          
Defined Benefit Plan Disclosure [Line Items]          
Assumptions used calculating benefit obligation, interest rate to annuitize cash balance account       3.09%  
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 0 0 0 $ 0 0
Benefit Obligation 5,194 4,710 4,586 5,194 4,710
Funded Status of Plan       (5,194) (4,710)
Change in Benefit Obligation          
Benefit Obligation, Beginning of Period 4,710 4,586      
Service Cost 324 414 45    
Interest Cost 217 192 209    
Plan Participants' Contributions 0 0      
Amendments   0      
Actuarial Loss 409 (17)      
Benefits Paid (466) (465)      
Benefit Obligation, End of Period 5,194 4,710 4,586    
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 466 465      
Plan Participants' Contributions 0 0      
Benefits Paid (466) (465)      
Fair Value of Plan Assets, End of Period 0 0 0    
Accumulated Benefit Obligation at December 31, 2019       5,125  
Amounts Recognized in the Consolidated Balance Sheets          
Prepaid Pension Asset       0 0
Accrued Benefit Liability       (5,194) (4,710)
Net Benefit Recognized       (5,194) (4,710)
Amounts Recognized in Other Comprehensive Income (Loss)          
Net Unamortized (Gain) Loss Arising During the Period 409 (17) 244    
Net Prior Service Cost Arising During the Period   0 0    
Amortization of Net Loss (113) (131) (129)    
Accretion of Net Retirement Plan Prior Service Credit, Tax (Expense) Benefit (54) (57) (57)    
Total Other Comprehensive (Loss) Income for Pension and Other Postretirement Benefit Plans 242 (205) 58    
Accumulated Other Comprehensive Income          
Net Actuarial Loss (Gains)       2,275 1,979
Prior Service Cost       378 432
Total Accumulated Other Comprehensive Income, Before Tax       2,653 $ 2,411
Amounts that will be Amortized from Accumulated Other Comprehensive Income the Next Year          
Net Actuarial Loss       132  
Prior Service Cost       $ 42  
Net Periodic Benefit Cost          
Service Cost 324 414 45    
Interest Cost 217 192 209    
Expected Return on Plan Assets 0 0 0    
Amortization of Prior Service (Credit) Cost 54 57 57    
Amortization of Net Loss 113 131 129    
Net Periodic Benefit Cost $ 708 $ 794 $ 440    
Weighted-Average Assumptions Used in Calculating Benefit Obligation          
Discount Rate       3.75% 4.80%
Rate of Compensation Increase       3.50% 3.50%
Interest Rate Credit for Determining Projected Cash Balance Account       3.00% 3.36%
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Discount Rate 4.80% 4.18% 4.73%    
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     4.50%    
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Amounts     4.50%    
Fair Value of Plan Assets $ 0 $ 0 $ 0 $ 0 $ 0
Expected Future Benefit Payments          
2020       444  
2021       427  
2022       409  
2023       389  
2024       555  
2025- 2029       2,482  
Estimated Contributions During 2020       $ 444  
Postretirement Benefit Plans          
Defined Benefit Plan Disclosure [Line Items]          
Assumptions used calculating benefit obligation, interest rate to annuitize cash balance account       3.68%  
Defined Benefit Plan Funded Status          
Fair Value of Plan Assets 0 0 0 $ 0 0
Benefit Obligation 8,652 7,706 7,727 8,652 7,706
Funded Status of Plan       (8,652) (7,706)
Change in Benefit Obligation          
Benefit Obligation, Beginning of Period 7,706 7,727      
Service Cost 121 136 130    
Interest Cost 364 333 339    
Plan Participants' Contributions 485 416      
Amendments   453      
Actuarial Loss 670 (664)      
Benefits Paid (694) (695)      
Benefit Obligation, End of Period 8,652 7,706 7,727    
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 209 279      
Plan Participants' Contributions 485 416      
Benefits Paid (694) (695)      
Fair Value of Plan Assets, End of Period 0 0 0    
Accumulated Benefit Obligation at December 31, 2019       8,652  
Amounts Recognized in the Consolidated Balance Sheets          
Prepaid Pension Asset       0 0
Accrued Benefit Liability       (8,652) (7,706)
Net Benefit Recognized       (8,652) (7,706)
Amounts Recognized in Other Comprehensive Income (Loss)          
Net Unamortized (Gain) Loss Arising During the Period 670 (665) (14)    
Net Prior Service Cost Arising During the Period   453 0    
Amortization of Net Loss 42 0 24    
Accretion of Net Retirement Plan Prior Service Credit, Tax (Expense) Benefit (101) (100) 11    
Total Other Comprehensive (Loss) Income for Pension and Other Postretirement Benefit Plans 611 (312) 21    
Accumulated Other Comprehensive Income          
Net Actuarial Loss (Gains)       (181) (893)
Prior Service Cost       685 786
Total Accumulated Other Comprehensive Income, Before Tax       504 $ (107)
Amounts that will be Amortized from Accumulated Other Comprehensive Income the Next Year          
Net Actuarial Loss       7  
Prior Service Cost       $ 106  
Net Periodic Benefit Cost          
Service Cost 121 136 130    
Interest Cost 364 333 339    
Expected Return on Plan Assets 0 0 0    
Amortization of Prior Service (Credit) Cost 101 100 (11)    
Amortization of Net Loss (42) 0 (24)    
Net Periodic Benefit Cost $ 544 $ 569 $ 434    
Weighted-Average Assumptions Used in Calculating Benefit Obligation          
Discount Rate       3.76% 4.81%
Rate of Compensation Increase       3.50% 3.50%
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Discount Rate 4.81% 4.22% 4.80%    
Rate of Compensation Increase 3.50% 3.50% 3.50%    
Fair Value of Plan Assets $ 0 $ 0 $ 0 $ 0 $ 0
Expected Future Benefit Payments          
2020       638  
2021       673  
2022       655  
2023       629  
2024       643  
2025- 2029       3,271  
Estimated Contributions During 2020       $ 638  
Minimum | Cash          
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Target Allocation Maximum, Percentage       0.00% 0.00%
Minimum | Interest-Bearing Money Market Fund          
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Target Allocation Maximum, Percentage       0.00% 0.00%
Minimum | Common Stock          
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Target Allocation Maximum, Percentage       0.00% 0.00%
Minimum | North Country Funds - Equity          
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Target Allocation Maximum, Percentage      
Minimum | Other Mutual Funds - Equity          
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Target Allocation Maximum, Percentage      
Minimum | Equity Funds          
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Target Allocation Maximum, Percentage       55.00% 55.00%
Minimum | North Country Funds - Fixed Income          
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Target Allocation Maximum, Percentage      
Minimum | Other Mutual Funds - Fixed Income          
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Target Allocation Maximum, Percentage      
Minimum | Fixed Income Funds          
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Target Allocation Maximum, Percentage       10.00% 10.00%
Minimum | Alternative ETF          
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Target Allocation Maximum, Percentage       0.00%  
Maximum | Cash          
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Target Allocation Maximum, Percentage       15.00% 15.00%
Maximum | Interest-Bearing Money Market Fund          
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Target Allocation Maximum, Percentage       15.00% 15.00%
Maximum | Common Stock          
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Target Allocation Maximum, Percentage       10.00% 10.00%
Maximum | North Country Funds - Equity          
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Target Allocation Maximum, Percentage      
Maximum | Other Mutual Funds - Equity          
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Target Allocation Maximum, Percentage      
Maximum | Equity Funds          
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Target Allocation Maximum, Percentage       85.00% 85.00%
Maximum | North Country Funds - Fixed Income          
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Target Allocation Maximum, Percentage      
Maximum | Other Mutual Funds - Fixed Income          
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Target Allocation Maximum, Percentage      
Maximum | Fixed Income Funds          
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Target Allocation Maximum, Percentage       30.00% 30.00%
Maximum | Alternative ETF          
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost          
Target Allocation Maximum, 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%        
[1] Payment for the acquisition of Arrow Financial Corporation common stock was under 10% of the total fair value of the employee's pension plan assets at the time of acquisition.
[2] The North Country Funds - Equity and the North Country Funds - Fixed Income are publicly traded mutual funds advised by Arrow's subsidiary, North Country Investment Advisers, Inc.