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v2.4.1.9

Employee Benefit Plans (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 15.00%us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent |  |
Defined Contribution Plan, Employer Contributions, Vesting Period | 5 years |  |
Defined Contribution Plan, Cost Recognized | $ 445 us-gaap_DefinedContributionPlanCostRecognized | $ 440 us-gaap_DefinedContributionPlanCostRecognized | $ 424 us-gaap_DefinedContributionPlanCostRecognized
Supplemental Employee Retirement Plan, Defined Benefit [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation | 1,443 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_PlanNameAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember | 1,458 us-gaap_DefinedBenefitPlanBenefitObligation / us-gaap_PlanNameAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember |
Pension and Other Postretirement Benefit Expense | 124 us-gaap_PensionAndOtherPostretirementBenefitExpense / us-gaap_PlanNameAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember | 126 us-gaap_PensionAndOtherPostretirementBenefitExpense / us-gaap_PlanNameAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember | 120 us-gaap_PensionAndOtherPostretirementBenefitExpense / us-gaap_PlanNameAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember
Cash Surrender Value of Life Insurance | 18,284 us-gaap_CashSurrenderValueOfLifeInsurance / us-gaap_PlanNameAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember | 17,790 us-gaap_CashSurrenderValueOfLifeInsurance / us-gaap_PlanNameAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember |
Defined Benefit Plan, Net Periodic Benefit Cost | 87 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_PlanNameAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember | 39 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_PlanNameAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember |
Multiemployer Plans, Postretirement Benefit [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost | $ 17 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_PlanNameAxis = us-gaap_MultiemployerPlansPostretirementBenefitMember | $ 22 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_PlanNameAxis = us-gaap_MultiemployerPlansPostretirementBenefitMember |
Defined Benefit Plan, Percentage of Plan Funded | 98.91%nwfl_DefinedBenefitPlanPercentageOfPlanFunded / us-gaap_PlanNameAxis = us-gaap_MultiemployerPlansPostretirementBenefitMember | 92.57%nwfl_DefinedBenefitPlanPercentageOfPlanFunded / us-gaap_PlanNameAxis = us-gaap_MultiemployerPlansPostretirementBenefitMember |
Defined Benefit Plan, Contribution Percentage | 5.00%nwfl_DefinedBenefitPlanContributionPercentage / us-gaap_PlanNameAxis = us-gaap_MultiemployerPlansPostretirementBenefitMember |  |

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- Definition Maximum percentage of contributions made to total contributions to the plan + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Percentage of the plan that has been funded + References No definition available. + Details
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- Definition The period that which employer contributions to defined contribution plans are fully vested. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765 + Details
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- Definition 1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Projected Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6522206 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Postretirement Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503904 + Details
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- Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Details
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- Details
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