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Retirement Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan, Funded Status of Plan [Abstract]        
Fair Value of Plan Assets   $ 39,880 $ 39,206  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period   39,206    
Contributions to Pension Plans   (328) (5,319) (1,813)
Fair Value of Plan Assets, End of Period   39,880 39,206  
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]        
Net Retirement Plan Loss, Before-Tax Amount   2,218 6,129 1,811
Net prior Service Cost Arising During the Period   405 266 (242)
Accretion of Net Retirement Plan Prior Service Credit, Tax (Expense) Benefit   8 43 74
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   39,880 39,206  
Percent of Total   100.00% 100.00%  
Expected Future Benefit Payments [Abstract]        
Health Care Cost Trend Rate Assumed for Next Year   9.00% 8.50%  
Rate to which the Cost Trend Rate is Assumed to Decline (the Ultimate Trend Rate)   5.00% 5.00%  
Year that the Rate Reaches the Ultimate Trend Rate   2021 2019  
Effect of One Percentage Point Increase on Service and Interest Cost Components   66    
Effect of One Percentage Point Decrease on Service and Interest Cost Components   (54)    
Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation   763    
Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation   (643)    
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
       
Defined Benefit Plan, Funded Status of Plan [Abstract]        
Fair Value of Plan Assets   39,880 39,206  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   39,880 39,206  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   39,880 39,206  
Significant Other Observable Inputs (Level 2) [Member]
       
Defined Benefit Plan, Funded Status of Plan [Abstract]        
Fair Value of Plan Assets   0 0  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
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  
Significant Unobservable Inputs (Level 3) [Member]
       
Defined Benefit Plan, Funded Status of Plan [Abstract]        
Fair Value of Plan Assets   0 0  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
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  
Cash and Cash Equivalents [Member]
       
Defined Benefit Plan, Funded Status of Plan [Abstract]        
Fair Value of Plan Assets   17 7  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period   7    
Fair Value of Plan Assets, End of Period   17 7  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   17 7  
Percent of Total   0.00% 0.00%  
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   17 7  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   17 7  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   17 7  
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  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
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  
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  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
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  
Money Market Funds [Member]
       
Defined Benefit Plan, Funded Status of Plan [Abstract]        
Fair Value of Plan Assets   5,236 1,857  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period   1,857    
Fair Value of Plan Assets, End of Period   5,236 1,857  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   5,236 1,857  
Percent of Total   13.10% 4.70%  
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   5,236 1,857  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   5,236 1,857  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   5,236 1,857  
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  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
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  
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  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
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  
Arrow Common Stock [Member]
       
Defined Benefit Plan, Funded Status of Plan [Abstract]        
Fair Value of Plan Assets   4,197 3,843  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period   3,843    
Fair Value of Plan Assets, End of Period   4,197 3,843  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   4,197 3,843  
Percent of Total   10.50% [1] 9.80%  
Target Allocation Minimum, Percentage   0.00% 0.00%  
Target Allocation Maximum, Percentage   10.00% 10.00%  
Arrow Common Stock [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   4,197 3,843  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   4,197 3,843  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   4,197 3,843  
Arrow Common Stock [Member] | Significant Other Observable Inputs (Level 2) [Member]
       
Defined Benefit Plan, Funded Status of Plan [Abstract]        
Fair Value of Plan Assets   0 0  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
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  
Arrow Common Stock [Member] | Significant Unobservable Inputs (Level 3) [Member]
       
Defined Benefit Plan, Funded Status of Plan [Abstract]        
Fair Value of Plan Assets   0 0  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
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  
Equity Funds [Member]
       
Defined Benefit Plan, Funded Status of Plan [Abstract]        
Fair Value of Plan Assets   24,203 28,167  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period   28,167    
Fair Value of Plan Assets, End of Period   24,203 28,167  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   24,203 28,167  
Percent of Total   60.80% 71.90%  
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   24,203 28,167  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   24,203 28,167  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   24,203 28,167  
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  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
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  
Equity Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
       
Defined Benefit Plan, Funded Status of Plan [Abstract]        
Fair Value of Plan Assets   0 0  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
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  
Equity Funds [Member] | North Country Funds - Equity [Member]
       
Defined Benefit Plan, Funded Status of Plan [Abstract]        
Fair Value of Plan Assets   13,043 [2] 13,259 [2]  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period   13,259 [2]    
Fair Value of Plan Assets, End of Period   13,043 [2] 13,259 [2]  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   13,043 [2] 13,259 [2]  
Percent of Total   32.80% [2] 33.90% [2]  
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   13,043 [2] 13,259 [2]  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   13,043 [2] 13,259 [2]  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   13,043 [2] 13,259 [2]  
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   0 [2] 0 [2]  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   0 [2] 0 [2]  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   0 [2] 0 [2]  
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   0 [2] 0 [2]  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   0 [2] 0 [2]  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   0 [2] 0 [2]  
Equity Funds [Member] | Other Mutual Funds - Equity [Member]
       
Defined Benefit Plan, Funded Status of Plan [Abstract]        
Fair Value of Plan Assets   11,160 14,908  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period   14,908    
Fair Value of Plan Assets, End of Period   11,160 14,908  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   11,160 14,908  
Percent of Total   28.00% 38.00%  
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   11,160 14,908  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   11,160 14,908  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   11,160 14,908  
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  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
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  
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  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
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  
Fixed Income Funds [Member]
       
Defined Benefit Plan, Funded Status of Plan [Abstract]        
Fair Value of Plan Assets   6,227 5,332  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period   5,332    
Fair Value of Plan Assets, End of Period   6,227 5,332  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   6,227 5,332  
Percent of Total   15.60% 13.60%  
Target Allocation Minimum, Percentage   10.00% 10.00%  
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   6,227 5,332  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   6,227 5,332  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   6,227 5,332  
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  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
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  
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  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
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  
Fixed Income Funds [Member] | North Country Funds - Fixed Income [Member]
       
Defined Benefit Plan, Funded Status of Plan [Abstract]        
Fair Value of Plan Assets   4,236 [2] 4,151 [2]  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period   4,151 [2]    
Fair Value of Plan Assets, End of Period   4,236 [2] 4,151 [2]  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   4,236 [2] 4,151 [2]  
Percent of Total   10.60% [2] 10.60% [2]  
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   4,236 [2] 4,151 [2]  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   4,236 [2] 4,151 [2]  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   4,236 [2] 4,151 [2]  
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   0 [2] 0 [2]  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   0 [2] 0 [2]  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   0 [2] 0 [2]  
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   0 [2] 0 [2]  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   0 [2] 0 [2]  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   0 [2] 0 [2]  
Fixed Income Funds [Member] | Other Mutual Funds - Fixed Income [Member]
       
Defined Benefit Plan, Funded Status of Plan [Abstract]        
Fair Value of Plan Assets   1,991 1,181  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period   1,181    
Fair Value of Plan Assets, End of Period   1,991 1,181  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   1,991 1,181  
Percent of Total   5.00% 3.00%  
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   1,991 1,181  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   1,991 1,181  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   1,991 1,181  
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  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
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  
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  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
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  
Employees' Pension Plan [Member]
       
Defined Benefit Plan, Funded Status of Plan [Abstract]        
Fair Value of Plan Assets   39,880 39,206 37,319
Benefit Obligation   37,046 35,047 32,337
Funded Status of Plan   2,834 4,159  
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit Obligation, Beginning of Period 37,046 35,047 32,337  
Service Cost   1,467 1,353 1,185
Interest Cost   1,436 1,598 1,667
Plan Participants' Contributions   0 0  
Amendments   0 191  
Actuarial Loss   2,857 1,616  
Benefits Paid   (3,761) (2,048)  
Benefit Obligation, End of Period   37,046 35,047 32,337
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period 39,880 39,206 37,319  
Actual Return on Plan Assets   4,435 (1,065)  
Contributions to Pension Plans   0 5,000  
Plan Participants' Contributions   0 0  
Benefits Paid   (3,761) (2,048)  
Fair Value of Plan Assets, End of Period   39,880 39,206 37,319
Accumulated Benefit Obligation at December 31, 2012   36,519    
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]        
Prepaid Benefit Cost   2,834 4,159  
Accrued Benefit Liability   0 0  
Net Benefit Cost Recognized   2,834 4,159  
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]        
Net Retirement Plan Loss, Before-Tax Amount   1,286 5,474 1,018
Net prior Service Cost Arising During the Period   0 191 0
Amortization of Net Loss   (1,387) (778) (899)
Accretion of Net Retirement Plan Prior Service Credit, Tax (Expense) Benefit   (41) (38) (25)
Total Other Comprehensive (Loss) Income for Pension and Other Postretirement Benefit Plans   (142) 4,849 94
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]        
Net Actuarial Loss   18,026 18,127  
Prior Service (Credit) Cost   (218) (177)  
Total Accumulated Other Comprehensive Income, Before Tax   17,808 17,950  
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 1,246      
Prior Service (Credit) Cost 37      
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service Cost   1,467 1,353 1,185
Interest Cost   1,436 1,598 1,667
Expected Return on Plan Assets   (2,865) (2,793) (2,454)
Amortization of Prior Service (Credit) Cost   41 38 25
Amortization of Net Loss   1,387 778 899
Net Periodic Benefit Cost   1,466 974 1,322
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]        
Discount Rate   3.55% 4.05%  
Rate of Compensation Increase   3.50% 3.50%  
Interest Rate Credit for Determining Projected Cash Balance Account   3.00% 3.25%  
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   4.05% 5.15% 5.80%
Expected Long-Term Return on Assets   7.50% 7.50% 7.50%
Rate of Compensation Increase   3.50% 3.50% 3.50%
Interest Rate Credit for Determining Projected Cash Balance Account   3.25% 4.25% 4.50%
Interest Rate to Annuitize Cash Balance Account   5.00% 5.50% 6.00%
Interest Rate to Convert Accuities to Actuarially Equivalent Lump Sum Amounts   5.00% 5.50% 6.00%
Fair Value of Plan Assets   39,880 39,206 37,319
Expected Future Benefit Payments [Abstract]        
2013   2,228    
2014   2,463    
2015   2,226    
2016   2,189    
2017   2,435    
2018-2022   12,415    
Estimated Contributions During 2013   0    
Select Executive Retirement Plan [Member]
       
Defined Benefit Plan, Funded Status of Plan [Abstract]        
Fair Value of Plan Assets   0 0 0
Benefit Obligation   5,324 4,529 4,319
Funded Status of Plan   (5,324) (4,529)  
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit Obligation, Beginning of Period 5,324 4,529 4,319  
Service Cost   87 81 56
Interest Cost   190 222 235
Plan Participants' Contributions   0 0  
Amendments   405 75  
Actuarial Loss   441 151  
Benefits Paid   (328) (319)  
Benefit Obligation, End of Period   5,324 4,529 4,319
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period 0 0 0  
Actual Return on Plan Assets   0 0  
Contributions to Pension Plans   328 319  
Plan Participants' Contributions   0 0  
Benefits Paid   (328) (319)  
Fair Value of Plan Assets, End of Period   0 0 0
Accumulated Benefit Obligation at December 31, 2012   5,324    
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]        
Prepaid Benefit Cost   0 0  
Accrued Benefit Liability   (5,324) (4,529)  
Net Benefit Cost Recognized   (5,324) (4,529)  
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]        
Net Retirement Plan Loss, Before-Tax Amount   441 151 339
Net prior Service Cost Arising During the Period   405 75 0
Amortization of Net Loss   (156) (147) (128)
Accretion of Net Retirement Plan Prior Service Credit, Tax (Expense) Benefit   (53) 32 105
Total Other Comprehensive (Loss) Income for Pension and Other Postretirement Benefit Plans   637 111 316
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]        
Net Actuarial Loss   2,368 2,083  
Prior Service (Credit) Cost   721 369  
Total Accumulated Other Comprehensive Income, Before Tax   3,089 2,452  
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 151      
Prior Service (Credit) Cost 78      
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service Cost   87 81 56
Interest Cost   190 222 235
Expected Return on Plan Assets   0 0 0
Amortization of Prior Service (Credit) Cost   53 (32) (105)
Amortization of Net Loss   156 147 128
Net Periodic Benefit Cost   486 418 314
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]        
Discount Rate   3.15% 4.05%  
Rate of Compensation Increase   3.50% 3.50%  
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   4.05% 5.15% 5.80%
Rate of Compensation Increase   3.50% 3.50% 3.50%
Interest Rate to Convert Accuities to Actuarially Equivalent Lump Sum Amounts   5.00% 5.50% 6.00%
Fair Value of Plan Assets   0 0 0
Expected Future Benefit Payments [Abstract]        
2013   457    
2014   468    
2015   443    
2016   431    
2017   418    
2018-2022   1,883    
Estimated Contributions During 2013   457    
Postretirement Benefit Plans [Member]
       
Defined Benefit Plan, Funded Status of Plan [Abstract]        
Fair Value of Plan Assets   0 0 0
Benefit Obligation   9,213 8,556 7,873
Funded Status of Plan   (9,213) (8,556)  
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit Obligation, Beginning of Period 9,213 8,556 7,873  
Service Cost   202 173 163
Interest Cost   338 372 421
Plan Participants' Contributions   348 382  
Amendments   0 0  
Actuarial Loss   491 505  
Benefits Paid   (722) (749)  
Benefit Obligation, End of Period   9,213 8,556 7,873
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period 0 0 0  
Actual Return on Plan Assets   0 0  
Contributions to Pension Plans   374 367  
Plan Participants' Contributions   348 382  
Benefits Paid   (722) (749)  
Fair Value of Plan Assets, End of Period   0 0 0
Accumulated Benefit Obligation at December 31, 2012   9,213    
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]        
Prepaid Benefit Cost   0 0  
Accrued Benefit Liability   (9,213) (8,556)  
Net Benefit Cost Recognized   (9,213) (8,556)  
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]        
Net Retirement Plan Loss, Before-Tax Amount   491 504 454
Net prior Service Cost Arising During the Period   0 0 (242)
Amortization of Net Loss   (134) (71) (85)
Accretion of Net Retirement Plan Prior Service Credit, Tax (Expense) Benefit   114 114 106
Total Other Comprehensive (Loss) Income for Pension and Other Postretirement Benefit Plans   471 547 233
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]        
Net Actuarial Loss   2,850 2,493  
Prior Service (Credit) Cost   (419) (533)  
Total Accumulated Other Comprehensive Income, Before Tax   2,431 1,960  
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 164      
Prior Service (Credit) Cost (114)      
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service Cost   202 173 163
Interest Cost   338 372 421
Expected Return on Plan Assets   0 0 0
Amortization of Prior Service (Credit) Cost   (114) (114) (105)
Amortization of Net Loss   134 71 85
Net Periodic Benefit Cost   560 502 564
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]        
Discount Rate   3.55% 4.05%  
Rate of Compensation Increase   3.50% 3.50%  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Discount Rate   4.05% 5.15% 5.80%
Rate of Compensation Increase   3.50% 3.50% 3.50%
Fair Value of Plan Assets   0 0 0
Expected Future Benefit Payments [Abstract]        
2013   494    
2014   527    
2015   541    
2016   562    
2017   572    
2018-2022   3,113    
Estimated Contributions During 2013   $ 494    
[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 Advisors, Inc.