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LOANS (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 544,499us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 545,235us-gaap_LoansAndLeasesReceivableGrossCarryingAmount $ 512,571us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Allowance for loan losses (8,894)us-gaap_LoansAndLeasesReceivableAllowance (8,583)us-gaap_LoansAndLeasesReceivableAllowance  
Net deferred origination fees and costs 1,329us-gaap_OtherDeferredCostsNet 1,327us-gaap_OtherDeferredCostsNet  
Loans, net 536,934us-gaap_LoansAndLeasesReceivableNetReportedAmount 537,979us-gaap_LoansAndLeasesReceivableNetReportedAmount  
Minimum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Delinquent loans revaluation period 3 months    
Maximum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Delinquent loans revaluation period 12 months    
Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 115,933us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
120,751us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
112,778us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
Loan portfolio by segment (in hundredths) 21.00%fnrn_LoanPortfolioBySegment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialPortfolioSegmentMember
   
Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 264,880us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
256,955us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
243,945us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Categories of loans 2fnrn_CommercialRealEstateLoansCategories
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
   
Loan portfolio by segment (in hundredths) 49.00%fnrn_LoanPortfolioBySegment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
   
Agriculture [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 54,719us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fnrn_AgricultureMember
61,144us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fnrn_AgricultureMember
40,926us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fnrn_AgricultureMember
Loan portfolio by segment (in hundredths) 10.00%fnrn_LoanPortfolioBySegment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= fnrn_AgricultureMember
   
Residential Mortgage [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 49,696us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
50,511us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
52,755us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
Loan portfolio by segment (in hundredths) 9.00%fnrn_LoanPortfolioBySegment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialMortgageMember
   
Residential Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 10,096us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
5,963us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
9,387us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
Loan portfolio by segment (in hundredths) 2.00%fnrn_LoanPortfolioBySegment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ResidentialRealEstateMember
   
Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 49,175us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
$ 49,911us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
$ 52,780us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember
Loan portfolio by segment (in hundredths) 9.00%fnrn_LoanPortfolioBySegment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember