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Retirement Benefit Plans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets $ 47,234 $ 47,234   $ 50,220 $ 47,234
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 47,234        
Fair Value of Plan Assets, End of Period 50,220 47,234      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets $ 47,234 $ 47,234   $ 50,220 $ 47,234
Percent of Total       100.00% 100.00%
Expected Future Benefit Payments [Abstract]          
Health Care Cost Trend Rate Assumed for Next Year 7.50% 7.75%      
Rate to which the Cost Trend Rate is Assumed to Decline (the Ultimate Trend Rate) 3.89% 3.89%      
Year that the Rate Reaches the Ultimate Trend Rate       2075 2075
Effect of One Percentage Point Increase on Service and Interest Cost Components $ 47        
Effect of One Percentage Point Decrease on Service and Interest Cost Components (40)        
Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation 513        
Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation (443)        
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 47,234 $ 47,234   $ 50,220 $ 47,234
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 47,234        
Fair Value of Plan Assets, End of Period 50,220 47,234      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 47,234 47,234   50,220 47,234
Significant Other Observable Inputs (Level 2) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Significant Unobservable Inputs (Level 3) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Cash and Cash Equivalents [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 44 44   40 44
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 44        
Fair Value of Plan Assets, End of Period 40 44      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets $ 44 $ 44   $ 40 $ 44
Percent of Total       0.10% 0.10%
Target Allocation Minimum, Percentage 0.00% 0.00%      
Target Allocation Maximum, Percentage 15.00% 15.00%      
Cash and Cash Equivalents [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets $ 44 $ 44   $ 40 $ 44
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 44        
Fair Value of Plan Assets, End of Period 40 44      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 44 44   40 44
Cash and Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Cash and Cash Equivalents [Member] | Significant Unobservable Inputs (Level 3) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Money Market Funds [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 2,471 2,471   3,080 2,471
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 2,471        
Fair Value of Plan Assets, End of Period 3,080 2,471      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets $ 2,471 $ 2,471   $ 3,080 $ 2,471
Percent of Total       6.10% 5.20%
Target Allocation Minimum, Percentage 0.00% 0.00%      
Target Allocation Maximum, Percentage 15.00% 15.00%      
Money Market Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets $ 2,471 $ 2,471   $ 3,080 $ 2,471
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 2,471        
Fair Value of Plan Assets, End of Period 3,080 2,471      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 2,471 2,471   3,080 2,471
Money Market Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Money Market Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Common Stock          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 4,554 4,554   6,592 4,554
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 4,554        
Fair Value of Plan Assets, End of Period 6,592 4,554      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets $ 4,554 $ 4,554   $ 6,592 $ 4,554
Percent of Total       13.10% [1] 9.60%
Target Allocation Minimum, Percentage 0.00% 0.00%      
Target Allocation Maximum, Percentage 10.00% 10.00%      
Common Stock | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets $ 4,554 $ 4,554   $ 6,592 $ 4,554
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 4,554        
Fair Value of Plan Assets, End of Period 6,592 4,554      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 4,554 4,554   6,592 4,554
Common Stock | Significant Other Observable Inputs (Level 2) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Common Stock | Significant Unobservable Inputs (Level 3) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Equity Funds [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 32,819 32,819   32,200 32,819
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 32,819        
Fair Value of Plan Assets, End of Period 32,200 32,819      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets $ 32,819 $ 32,819   $ 32,200 $ 32,819
Percent of Total       64.20% 69.50%
Target Allocation Minimum, Percentage 55.00% 55.00%      
Target Allocation Maximum, Percentage 85.00% 85.00%      
Equity Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets $ 32,819 $ 32,819   $ 32,200 $ 32,819
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 32,819        
Fair Value of Plan Assets, End of Period 32,200 32,819      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 32,819 32,819   32,200 32,819
Equity Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Equity Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Equity Funds [Member] | North Country Funds - Equity [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets [2] 19,625 19,625   18,640 19,625
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period [2] 19,625        
Fair Value of Plan Assets, End of Period [2] 18,640 19,625      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets [2] $ 19,625 $ 19,625   $ 18,640 $ 19,625
Percent of Total [2]       37.20% 41.60%
Target Allocation Minimum, Percentage      
Target Allocation Maximum, Percentage      
Equity Funds [Member] | North Country Funds - Equity [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets [2] $ 19,625 $ 19,625   $ 18,640 $ 19,625
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period [2] 19,625        
Fair Value of Plan Assets, End of Period [2] 18,640 19,625      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets [2] 19,625 19,625   18,640 19,625
Equity Funds [Member] | North Country Funds - Equity [Member] | Significant Other Observable Inputs (Level 2) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets [2] 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period [2] 0        
Fair Value of Plan Assets, End of Period [2] 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets [2] 0 0   0 0
Equity Funds [Member] | North Country Funds - Equity [Member] | Significant Unobservable Inputs (Level 3) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets [2] 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period [2] 0        
Fair Value of Plan Assets, End of Period [2] 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets [2] 0 0   0 0
Equity Funds [Member] | Other Mutual Funds - Equity [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 13,194 13,194   13,560 13,194
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 13,194        
Fair Value of Plan Assets, End of Period 13,560 13,194      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets $ 13,194 $ 13,194   $ 13,560 $ 13,194
Percent of Total       27.00% 27.90%
Target Allocation Minimum, Percentage      
Target Allocation Maximum, Percentage      
Equity Funds [Member] | Other Mutual Funds - Equity [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets $ 13,194 $ 13,194   $ 13,560 $ 13,194
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 13,194        
Fair Value of Plan Assets, End of Period 13,560 13,194      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 13,194 13,194   13,560 13,194
Equity Funds [Member] | Other Mutual Funds - Equity [Member] | Significant Other Observable Inputs (Level 2) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Equity Funds [Member] | Other Mutual Funds - Equity [Member] | Significant Unobservable Inputs (Level 3) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Fixed Income Funds [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 7,346 7,346   8,308 7,346
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 7,346        
Fair Value of Plan Assets, End of Period 8,308 7,346      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets $ 7,346 $ 7,346   $ 8,308 $ 7,346
Percent of Total       16.50% 15.60%
Target Allocation Minimum, Percentage 10.00% 15.00%      
Target Allocation Maximum, Percentage 30.00% 30.00%      
Fixed Income Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets $ 7,346 $ 7,346   $ 8,308 $ 7,346
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 7,346        
Fair Value of Plan Assets, End of Period 8,308 7,346      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 7,346 7,346   8,308 7,346
Fixed Income Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Fixed Income Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Fixed Income Funds [Member] | North Country Funds - Fixed Income [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets [2] 7,346 7,346   7,332 7,346
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period [2] 7,346        
Fair Value of Plan Assets, End of Period [2] 7,332 7,346      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets [2] $ 7,346 $ 7,346   $ 7,332 $ 7,346
Percent of Total [2]       14.60% 15.60%
Target Allocation Minimum, Percentage      
Target Allocation Maximum, Percentage      
Fixed Income Funds [Member] | North Country Funds - Fixed Income [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets [2] $ 7,346 $ 7,346   $ 7,332 $ 7,346
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period [2] 7,346        
Fair Value of Plan Assets, End of Period [2] 7,332 7,346      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets [2] 7,346 7,346   7,332 7,346
Fixed Income Funds [Member] | North Country Funds - Fixed Income [Member] | Significant Other Observable Inputs (Level 2) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets [2] 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period [2] 0        
Fair Value of Plan Assets, End of Period [2] 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets [2] 0 0   0 0
Fixed Income Funds [Member] | North Country Funds - Fixed Income [Member] | Significant Unobservable Inputs (Level 3) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets [2] 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period [2] 0        
Fair Value of Plan Assets, End of Period [2] 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets [2] 0 0   0 0
Fixed Income Funds [Member] | Other Mutual Funds - Fixed Income [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   976 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 976 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets $ 0 $ 0   $ 976 $ 0
Percent of Total       1.90% 0.00%
Target Allocation Minimum, Percentage      
Target Allocation Maximum, Percentage      
Fixed Income Funds [Member] | Other Mutual Funds - Fixed Income [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets $ 0 $ 0   $ 976 $ 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 976 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   976 0
Fixed Income Funds [Member] | Other Mutual Funds - Fixed Income [Member] | Significant Other Observable Inputs (Level 2) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Fixed Income Funds [Member] | Other Mutual Funds - Fixed Income [Member] | Significant Unobservable Inputs (Level 3) [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0        
Fair Value of Plan Assets, End of Period 0 0      
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Fair Value of Plan Assets 0 0   0 0
Employees' Pension Plan [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 47,234 45,704 $ 45,704 50,220 47,234
Benefit Obligation 35,982 36,966 36,966 36,154 35,982
Funded Status of Plan       14,066 11,252
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]          
Benefit Obligation, Beginning of Period 35,982 36,966      
Service Cost 1,400 1,503 1,410    
Interest Cost 1,641 1,545 1,621    
Plan Participants' Contributions 0 0      
Amendments 0 277      
Actuarial Loss (738) (1,670)      
Benefits Paid (2,131) (2,639)      
Benefit Obligation, End of Period 36,154 35,982 36,966    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 47,234 45,704      
Actual Return on Plan Assets 5,117 1,169      
Contributions to Pension Plans 0 3,000      
Plan Participants' Contributions 0 0      
Benefits Paid (2,131) (2,639)      
Fair Value of Plan Assets, End of Period 50,220 47,234 45,704    
Accumulated Benefit Obligation at December 31, 2012       35,770  
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]          
Prepaid Benefit Cost       14,066 11,252
Accrued Benefit Liability       0 0
Net Benefit Cost Recognized       14,066 11,252
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]          
Net Retirement Plan Loss, Before-Tax Amount (2,657) 472 2,855    
Net prior Service Cost Arising During the Period 0 277 0    
Amortization of Net Loss (591) (601) (356)    
Accretion of Net Retirement Plan Prior Service Credit, Tax (Expense) Benefit 57 83 45    
Total Other Comprehensive (Loss) Income for Pension and Other Postretirement Benefit Plans (3,191) 231 2,544    
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]          
Net Actuarial Loss       7,479 10,727
Prior Service (Credit) Cost       207 150
Total Accumulated Other Comprehensive Income, Before Tax       $ 7,686 $ 10,877
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]          
Net Actuarial Loss 232        
Prior Service (Credit) Cost (57)        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]          
Service Cost 1,400 1,503 1,410    
Interest Cost 1,641 1,545 1,621    
Expected Return on Plan Assets (3,198) (3,311) (3,230)    
Amortization of Prior Service (Credit) Cost (57) (83) (45)    
Amortization of Net Loss 591 601 356    
Net Periodic Benefit Cost $ 377 $ 255 $ 112    
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]          
Discount Rate       4.83% 4.73%
Rate of Compensation Increase       3.50% 3.50%
Interest Rate Credit for Determining Projected Cash Balance Account       3.00% 3.03%
Interest Rate to Annuitize Cash Balance Account       4.50% 5.00%
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Account       4.50% 5.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Discount Rate 4.73% 4.31% 5.10%    
Expected Long-Term Return on Assets 7.00% 7.50% 7.50%    
Rate of Compensation Increase 3.50% 3.50% 3.50%    
Interest Rate Credit for Determining Projected Cash Balance Account 3.03% 3.04% 4.00%    
Interest Rate to Annuitize Cash Balance Account 5.00% 4.75% 5.25%    
Interest Rate to Convert Accuities to Actuarially Equivalent Lump Sum Amounts 5.00% 4.75% 5.25%    
Fair Value of Plan Assets $ 47,234 $ 45,704 $ 45,704 $ 50,220 $ 47,234
Expected Future Benefit Payments [Abstract]          
2017       2,398  
2018       2,168  
2019       2,413  
2020       2,684  
2021       2,418  
2022- 2026       13,716  
Estimated Contributions During 2015 0        
Select Executive Retirement Plan [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0 0 0 0
Benefit Obligation 4,784 5,072 5,072 4,547 4,784
Funded Status of Plan       (4,547) (4,784)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]          
Benefit Obligation, Beginning of Period 4,784 5,072      
Service Cost 40 32 10    
Interest Cost 206 211 206    
Plan Participants' Contributions 0 0      
Amendments 0 91      
Actuarial Loss (31) (152)      
Benefits Paid (452) (470)      
Benefit Obligation, End of Period 4,547 4,784 5,072    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0 0      
Actual Return on Plan Assets 0 0      
Contributions to Pension Plans 452 470      
Plan Participants' Contributions 0 0      
Benefits Paid (452) (470)      
Fair Value of Plan Assets, End of Period 0 0 0    
Accumulated Benefit Obligation at December 31, 2012       4,547  
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]          
Prepaid Benefit Cost       0 0
Accrued Benefit Liability       (4,547) (4,784)
Net Benefit Cost Recognized       (4,547) (4,784)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]          
Net Retirement Plan Loss, Before-Tax Amount (32) (152) 871    
Net prior Service Cost Arising During the Period 0 91 0    
Amortization of Net Loss (125) (131) (93)    
Accretion of Net Retirement Plan Prior Service Credit, Tax (Expense) Benefit (57) (58) (72)    
Total Other Comprehensive (Loss) Income for Pension and Other Postretirement Benefit Plans (214) (250) 706    
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]          
Net Actuarial Loss       2,012 2,169
Prior Service (Credit) Cost       546 603
Total Accumulated Other Comprehensive Income, Before Tax       $ 2,558 $ 2,772
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]          
Net Actuarial Loss 117        
Prior Service (Credit) Cost 57        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]          
Service Cost 40 32 10    
Interest Cost 206 211 206    
Expected Return on Plan Assets 0 0 0    
Amortization of Prior Service (Credit) Cost 57 58 72    
Amortization of Net Loss 125 131 93    
Net Periodic Benefit Cost $ 428 $ 432 $ 381    
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]          
Discount Rate       4.73% 4.61%
Rate of Compensation Increase       3.50% 3.00%
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Account       4.50% 5.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Discount Rate 4.61% 4.26% 4.85%    
Rate of Compensation Increase 3.50% 3.50% 3.50%    
Interest Rate to Convert Accuities to Actuarially Equivalent Lump Sum Amounts 5.00% 4.75% 5.25%    
Fair Value of Plan Assets $ 0 $ 0 $ 0 $ 0 $ 0
Expected Future Benefit Payments [Abstract]          
2017       441  
2018       429  
2019       417  
2020       403  
2021       388  
2022- 2026       1,767  
Estimated Contributions During 2015 441        
Postretirement Benefit Plans [Member]          
Defined Benefit Plan, Funded Status of Plan [Abstract]          
Fair Value of Plan Assets 0 0 0 0 0
Benefit Obligation 7,701 9,170 9,170 7,623 7,701
Funded Status of Plan       (7,623) (7,701)
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]          
Benefit Obligation, Beginning of Period 7,701 9,170      
Service Cost 147 250 173    
Interest Cost 340 394 374    
Plan Participants' Contributions 402 481      
Amendments 0 0      
Actuarial Loss (327) (1,715)      
Benefits Paid (640) (879)      
Benefit Obligation, End of Period 7,623 7,701 9,170    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]          
Fair Value of Plan Assets, Beginning of Period 0 0      
Actual Return on Plan Assets 0 0      
Contributions to Pension Plans 238 398      
Plan Participants' Contributions 402 481      
Benefits Paid (640) (879)      
Fair Value of Plan Assets, End of Period 0 0 0    
Accumulated Benefit Obligation at December 31, 2012       7,623  
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]          
Prepaid Benefit Cost       0 0
Accrued Benefit Liability       (7,623) (7,701)
Net Benefit Cost Recognized       (7,623) (7,701)
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]          
Net Retirement Plan Loss, Before-Tax Amount (328) (1,715) 884    
Net prior Service Cost Arising During the Period 0 0 570    
Amortization of Net Loss 0 (114) (25)    
Accretion of Net Retirement Plan Prior Service Credit, Tax (Expense) Benefit 12 31 114    
Total Other Comprehensive (Loss) Income for Pension and Other Postretirement Benefit Plans (316) (1,798) 1,543    
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]          
Net Actuarial Loss       (238) 90
Prior Service (Credit) Cost       422 410
Total Accumulated Other Comprehensive Income, Before Tax       $ 184 $ 500
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]          
Net Actuarial Loss 0        
Prior Service (Credit) Cost (10)        
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]          
Service Cost 147 250 173    
Interest Cost 340 394 374    
Expected Return on Plan Assets 0 0 0    
Amortization of Prior Service (Credit) Cost (12) (31) (114)    
Amortization of Net Loss 0 114 25    
Net Periodic Benefit Cost $ 475 $ 727 $ 458    
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]          
Discount Rate       4.80% 4.69%
Rate of Compensation Increase       3.50% 3.50%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]          
Discount Rate 4.69% 4.31% 5.10%    
Rate of Compensation Increase 3.50% 3.50% 3.50%    
Fair Value of Plan Assets $ 0 $ 0 $ 0 $ 0 $ 0
Expected Future Benefit Payments [Abstract]          
2017       515  
2018       539  
2019       561  
2020       560  
2021       586  
2022- 2026       $ 2,955  
Estimated Contributions During 2015 $ 515        
[1] 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.