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STOCK PLANS (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Jan. 22, 2015
STOCK PLANS [Abstract]    
Dividend declared as percentage of stock (in hundredths)   4.00%fnrn_DividendDeclaredAsPercentageOfStock
Employee Stock Purchase Plan [Member]    
Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]    
Shares authorized under plan (in shares) 322,385fnrn_EmployeeStockPurchasePlanESPPSharesAuthorized
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
 
Plan expiration date Mar. 15, 2016  
Plan implemented participation period 27 months  
Eligibility employment period required for plan participation 90 days  
Maximum employee compensation that can be withheld to purchase common stock (in hundredths) 10.00%fnrn_MaximumPercentageOfEmployeeCompensationWithheldToPurchaseCommonStock
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
 
Purchase price of stock in percentage for participation (in hundredths) 85.00%fnrn_PurchasePriceOfStockInPercentageForParticipation
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
 
Unrecognized compensation cost $ 16,000fnrn_EmployeeStockPurchasePlanUnrecognizedCompensationExpense
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
 
Weighted average fair value at issuance date (in dollars per share) $ 1.67fnrn_WeightedAverageFairValueAtIssuanceDate
/ us-gaap_PlanNameAxis
= us-gaap_EmployeeStockMember
 
Weighted average period to recognize the unrecognized compensation 0 years 9 months  
Stock Options [Member]    
Number of Shares [Roll Forward]    
Options outstanding at Beginning of Period (in shares) 313,483us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Granted (in shares) 41,047us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Expired (in shares) (86,875)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Cancelled / Forfeited (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Exercised (in shares) (19,846)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Options outstanding at End of Period (in shares) 247,809us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Exercisable (vested) at End of Period (in shares) 176,160us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Weighted Average Exercise Price [Roll Forward]    
Options outstanding at Beginning of Period (in dollars per share) $ 11.54us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Granted (in dollars per share) $ 7.60us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Expired (in dollars per share) $ 10.00us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Cancelled / Forfeited (in dollars per share) $ 0us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Exercised (in dollars per share) $ 4.23us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Options outstanding at End of Period (in dollars per share) $ 12.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Exercisable (vested) at End of Period (in dollars per share) $ 14.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Additional disclosures [Abstract]    
Options outstanding, Aggregate Intrinsic Value 236,940us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Options Exercisable, Aggregate Intrinsic Value 169,885us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Options outstanding, Weighted Average Remaining Contractual Term 4 years 7 months 24 days  
Options Exercisable, Weighted Average Remaining Contractual Term 2 years 9 months 25 days  
Weighted average fair value of options granted (in dollars per share) $ 2.67us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Unrecognized compensation related to non-vested stock options 182,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Unrecognized compensation cost, period for recognition 3 years 2 months 16 days  
Allocated share-based compensation expense 16,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Weighted average assumptions used in valuation [Abstract]    
Risk Free Interest Rate (in hundredths) 1.61%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Expected Dividend Yield (in hundredths) 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Expected Life in Years 5 years  
Expected Price Volatility (in hundredths) 37.38%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Restricted Stock [Member]    
Additional disclosures [Abstract]    
Unrecognized compensation cost, period for recognition 3 years 2 months 1 day  
Allocated share-based compensation expense 36,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Non-vested restricted stock awards outstanding, Number of Shares [Roll Forward]    
Non-vested restricted stock outstanding at Beginning of Period (in shares) 73,827us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Granted (in shares) 30,056us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Cancelled/Forfeited (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Exercised/Released/Vested (in shares) (18,304)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Non-vested restricted stock outstanding at End of Period (in shares) 85,579us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Non-vested restricted stock awards outstanding, Weighted Average Grant-Date Fair Value [Roll Forward]    
Non-vested restricted stock outstanding at Beginning of Period (in dollars per share) $ 5.64us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Granted (in dollars per share) $ 7.59us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Cancelled/Forfeited (in dollars per share) $ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Exercised/Released/Vested (in dollars per share) $ 4.66us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Non-vested restricted stock outstanding at End of Period (in dollars per share) $ 6.54us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Non-vested restricted stock awards, Additional Disclosures [Abstract]    
Aggregate Intrinsic Value, End of Period 676,074us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Weighted Average Remaining Contractual Term 8 years 8 months 26 days  
Unrecognized compensation related to restricted stock 402,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Employee Stock Purchase Plan [Member]    
Additional disclosures [Abstract]    
Allocated share-based compensation expense $ 7,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
 
Weighted average assumptions used in valuation [Abstract]    
Risk Free Interest Rate (in hundredths) 0.14%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
 
Expected Dividend Yield (in hundredths) 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
 
Expected Life in Years 1 year  
Expected Price Volatility (in hundredths) 15.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember