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Retirement Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan, Funded Status of Plan [Abstract]        
Fair Value of Plan Assets   $ 44,653 $ 39,880  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period   39,880    
Contributions to Pension Plans   (473) (328) (5,319)
Fair Value of Plan Assets, End of Period   44,653 39,880  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   44,653 39,880  
Percent of Total   100.00% 100.00%  
Expected Future Benefit Payments [Abstract]        
Health Care Cost Trend Rate Assumed for Next Year   8.50% 9.00%  
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 2021  
Effect of One Percentage Point Increase on Service and Interest Cost Components   59    
Effect of One Percentage Point Decrease on Service and Interest Cost Components   (49)    
Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation   557    
Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation   (478)    
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
       
Defined Benefit Plan, Funded Status of Plan [Abstract]        
Fair Value of Plan Assets   44,653 39,880  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   44,653 39,880  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   44,653 39,880  
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   7 17  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period   17    
Fair Value of Plan Assets, End of Period   7 17  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   7 17  
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   7 17  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   7 17  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   7 17  
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   3,941 5,236  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period   5,236    
Fair Value of Plan Assets, End of Period   3,941 5,236  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   3,941 5,236  
Percent of Total   8.80% 13.10%  
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   3,941 5,236  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   3,941 5,236  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   3,941 5,236  
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   4,291 4,197  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period   4,197    
Fair Value of Plan Assets, End of Period   4,291 4,197  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   4,291 4,197  
Percent of Total   9.60% 10.50% [1]  
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   4,291 4,197  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   4,291 4,197  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   4,291 4,197  
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   31,757 24,203  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period   24,203    
Fair Value of Plan Assets, End of Period   31,757 24,203  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   31,757 24,203  
Percent of Total   71.20% 60.80%  
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   31,757 24,203  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   31,757 24,203  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   31,757 24,203  
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   17,419 [2] 13,043 [2]  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period   13,043 [2]    
Fair Value of Plan Assets, End of Period   17,419 [2] 13,043 [2]  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   17,419 [2] 13,043 [2]  
Percent of Total   39.10% [2] 32.80% [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   17,419 [2] 13,043 [2]  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   17,419 [2] 13,043 [2]  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   17,419 [2] 13,043 [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   14,338 11,160  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period   11,160    
Fair Value of Plan Assets, End of Period   14,338 11,160  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   14,338 11,160  
Percent of Total   32.10% 28.00%  
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   14,338 11,160  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   14,338 11,160  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   14,338 11,160  
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   4,657 6,227  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period   6,227    
Fair Value of Plan Assets, End of Period   4,657 6,227  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   4,657 6,227  
Percent of Total   10.40% 15.60%  
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   4,657 6,227  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   4,657 6,227  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   4,657 6,227  
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   4,309 [2] 4,236 [2]  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period   4,236 [2]    
Fair Value of Plan Assets, End of Period   4,309 [2] 4,236 [2]  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   4,309 [2] 4,236 [2]  
Percent of Total   9.60% [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   4,309 [2] 4,236 [2]  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   4,309 [2] 4,236 [2]  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   4,309 [2] 4,236 [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   348 1,991  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period   1,991    
Fair Value of Plan Assets, End of Period   348 1,991  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   348 1,991  
Percent of Total   0.80% 5.00%  
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   348 1,991  
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, End of Period   348 1,991  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Fair Value of Plan Assets   348 1,991  
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   44,653 39,880 39,206
Benefit Obligation   33,259 37,046 35,047
Funded Status of Plan   11,394 2,834  
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit Obligation, Beginning of Period 33,259 37,046 35,047  
Service Cost   1,506 1,467 1,353
Interest Cost   1,261 1,436 1,598
Plan Participants' Contributions   0 0  
Amendments   0 0  
Actuarial Loss   (3,820) 2,857  
Benefits Paid   (2,734) (3,761)  
Benefit Obligation, End of Period   33,259 37,046 35,047
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]        
Fair Value of Plan Assets, Beginning of Period 44,653 39,880 39,206  
Actual Return on Plan Assets   7,507 4,435  
Contributions to Pension Plans   0 0  
Plan Participants' Contributions   0 0  
Benefits Paid   (2,734) (3,761)  
Fair Value of Plan Assets, End of Period   44,653 39,880 39,206
Accumulated Benefit Obligation at Period End   32,886    
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]        
Prepaid Pension Asset   11,394 2,834  
Accrued Benefit Liability   0 0  
Net Benefit Recognized   11,394 2,834  
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]        
Net Retirement Plan Loss, Before-Tax Amount   (8,438) 1,286 5,474
Net Prior Service Cost Arising During the Period   0 0 191
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax   (1,231) (1,387) (778)
Accretion of Net Retirement Plan Prior Service Credit, Tax (Expense) Benefit   (37) (41) (38)
Total Other Comprehensive (Loss) Income for Pension and Other Postretirement Benefit Plans   (9,706) (142) 4,849
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]        
Net Actuarial Loss   8,357 18,026  
Prior Service (Credit) Cost   (255) (218)  
Total Accumulated Other Comprehensive Income, Before Tax   8,102 17,808  
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 345      
Prior Service (Credit) Cost (45)      
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service Cost   1,506 1,467 1,353
Interest Cost   1,261 1,436 1,598
Expected Return on Plan Assets   (2,889) (2,865) (2,793)
Amortization of Prior Service (Credit) Cost   37 41 38
Amortization of Net Loss   1,232 1,387 778
Net Periodic Benefit Cost   1,147 1,466 974
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]        
Discount Rate   5.10% 3.55%  
Rate of Compensation Increase   3.50% 3.50%  
Interest Rate Credit for Determining Projected Cash Balance Account   4.00% 3.00%  
Interest Rate to Annuitize Cash Balance Account   5.25% 4.50%  
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Account   5.25% 4.50%  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Discount Rate   3.55% 4.05% 5.15%
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   3.00% 3.25% 4.25%
Interest Rate to Annuitize Cash Balance Account   4.50% 5.00% 5.50%
Interest Rate to Convert Accuities to Actuarially Equivalent Lump Sum Amounts   4.50% 5.00% 5.50%
Fair Value of Plan Assets   44,653 39,880 39,206
Expected Future Benefit Payments [Abstract]        
2014   3,068    
2015   2,047    
2016   2,344    
2017   2,252    
2018   2,165    
2019 - 2023   12,516    
Estimated Contributions During 2014 0      
Select Executive Retirement Plan [Member]
       
Defined Benefit Plan, Funded Status of Plan [Abstract]        
Fair Value of Plan Assets   0 0 0
Benefit Obligation   4,459 5,324 4,529
Funded Status of Plan   (4,459) (5,324)  
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit Obligation, Beginning of Period 4,459 5,324 4,529  
Service Cost   0 87 81
Interest Cost   163 190 222
Plan Participants' Contributions   0 0  
Amendments   0 405  
Actuarial Loss   (555) 441  
Benefits Paid   (473) (328)  
Benefit Obligation, End of Period   4,459 5,324 4,529
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   473 328  
Plan Participants' Contributions   0 0  
Benefits Paid   (473) (328)  
Fair Value of Plan Assets, End of Period   0 0 0
Accumulated Benefit Obligation at Period End   4,459    
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]        
Prepaid Pension Asset   0 0  
Accrued Benefit Liability   (4,459) (5,324)  
Net Benefit Recognized   (4,459) (5,324)  
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]        
Net Retirement Plan Loss, Before-Tax Amount   (554) 441 151
Net Prior Service Cost Arising During the Period   0 405 75
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax   (140) (156) (147)
Accretion of Net Retirement Plan Prior Service Credit, Tax (Expense) Benefit   (79) (53) 32
Total Other Comprehensive (Loss) Income for Pension and Other Postretirement Benefit Plans   (773) 637 111
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]        
Net Actuarial Loss   1,674 2,368  
Prior Service (Credit) Cost   642 721  
Total Accumulated Other Comprehensive Income, Before Tax   2,316 3,089  
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 90      
Prior Service (Credit) Cost 72      
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service Cost   0 87 81
Interest Cost   163 190 222
Expected Return on Plan Assets   0 0 0
Amortization of Prior Service (Credit) Cost   79 53 (32)
Amortization of Net Loss   139 156 147
Net Periodic Benefit Cost   381 486 418
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]        
Discount Rate   4.85% 3.15%  
Rate of Compensation Increase   3.50% 3.50%  
Interest Rate to Convert Annuities to Actuarially Equivalent Lump Sum Account   5.25% 4.50%  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Discount Rate   3.15% 4.05% 5.15%
Rate of Compensation Increase   3.50% 3.50% 3.50%
Interest Rate to Convert Accuities to Actuarially Equivalent Lump Sum Amounts   4.50% 5.00% 5.50%
Fair Value of Plan Assets   0 0 0
Expected Future Benefit Payments [Abstract]        
2014   452    
2015   440    
2016   416    
2017   402    
2018   388    
2019 - 2023   1,699    
Estimated Contributions During 2014 452      
Postretirement Benefit Plans [Member]
       
Defined Benefit Plan, Funded Status of Plan [Abstract]        
Fair Value of Plan Assets   0 0 0
Benefit Obligation   7,619 9,213 8,556
Funded Status of Plan   (7,619) (9,213)  
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit Obligation, Beginning of Period 7,619 9,213 8,556  
Service Cost   211 202 173
Interest Cost   308 338 372
Plan Participants' Contributions   368 348  
Amendments   0 0  
Actuarial Loss   (1,648) 491  
Benefits Paid   (833) (722)  
Benefit Obligation, End of Period   7,619 9,213 8,556
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   465 374  
Plan Participants' Contributions   368 348  
Benefits Paid   (833) (722)  
Fair Value of Plan Assets, End of Period   0 0 0
Accumulated Benefit Obligation at Period End   7,619    
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]        
Prepaid Pension Asset   0 0  
Accrued Benefit Liability   (7,619) (9,213)  
Net Benefit Recognized   (7,619) (9,213)  
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]        
Net Retirement Plan Loss, Before-Tax Amount   (1,648) 491 504
Net Prior Service Cost Arising During the Period   0 0 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax   (142) (134) (71)
Accretion of Net Retirement Plan Prior Service Credit, Tax (Expense) Benefit   114 114 114
Total Other Comprehensive (Loss) Income for Pension and Other Postretirement Benefit Plans   (1,676) 471 547
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]        
Net Actuarial Loss   1,060 2,850  
Prior Service (Credit) Cost   (305) (419)  
Total Accumulated Other Comprehensive Income, Before Tax   755 2,431  
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 26      
Prior Service (Credit) Cost (114)      
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]        
Service Cost   211 202 173
Interest Cost   308 338 372
Expected Return on Plan Assets   0 0 0
Amortization of Prior Service (Credit) Cost   (114) (114) (114)
Amortization of Net Loss   142 134 71
Net Periodic Benefit Cost   547 560 502
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]        
Discount Rate   5.10% 3.55%  
Rate of Compensation Increase   3.50% 3.50%  
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]        
Discount Rate   3.55% 4.05% 5.15%
Rate of Compensation Increase   3.50% 3.50% 3.50%
Fair Value of Plan Assets   0 0 0
Expected Future Benefit Payments [Abstract]        
2014   510    
2015   531    
2016   539    
2017   549    
2018   562    
2019 - 2023   3,026    
Estimated Contributions During 2014 $ 510      
[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.