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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet credit risks $ 190,737,000us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability $ 174,348,000us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
Undisbursed Loan Commitments [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet credit risks 184,011,000us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember		 171,019,000us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
Standby Letters of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet credit risks 2,132,000us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_StandbyLettersOfCreditMember		 2,099,000us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_StandbyLettersOfCreditMember
Commitments to Sell Loans [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet credit risks 4,594,000us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_LoanOriginationCommitmentsMember		 1,230,000us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_LoanOriginationCommitmentsMember
Performance Standby Letters of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet credit risks 2,132,000us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_PerformanceGuaranteeMember		  
Financial Standby Letter of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet credit risks 0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FinancialStandbyLetterOfCreditMember		  
Derivative [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet credit risks 0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_DerivativeMember		  
Reserve for Off-balance Sheet Activity [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Reserve for unfunded commitments $ 793,000fnrn_ReserveForOffBalanceSheetActivities
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ReserveForOffBalanceSheetActivitiesMember