XML 14 R33.htm IDEA: XBRL DOCUMENT v2.4.1.9
LOANS, Troubled debt Restructurings (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Loan
Mar. 31, 2014
Loan
Dec. 31, 2014
Financing Receivable, Modifications [Line Items]      
Number of months continuous payment for reclassification of nonaccrual loans to accruing status 6 months    
TDR loans $ 6,593,000us-gaap_FinancingReceivableModificationsRecordedInvestment   $ 6,712,000us-gaap_FinancingReceivableModificationsRecordedInvestment
Specific reserves for TDR loans 850,000fnrn_FinancingReceivableSpecificReservesForModifiedRecordedInvestment   860,000fnrn_FinancingReceivableSpecificReservesForModifiedRecordedInvestment
TDR loans performing in compliance with modified terms 5,435,000fnrn_FinancingReceivableModificationsLoansInCompliance   5,467,000fnrn_FinancingReceivableModificationsLoansInCompliance
Troubled Debt Restructurings [Abstract]      
Number of Contracts 1us-gaap_FinancingReceivableModificationsNumberOfContracts2 2us-gaap_FinancingReceivableModificationsNumberOfContracts2  
Pre-modification outstanding recorded investment 109,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 498,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2  
Post-modification outstanding recorded investment 109,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 498,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2  
Number of loans restructured and subsequent default 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1 0us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1  
Consumer [Member]      
Troubled Debt Restructurings [Abstract]      
Number of Contracts 1us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember
2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember
 
Pre-modification outstanding recorded investment 109,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember
498,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember
 
Post-modification outstanding recorded investment $ 109,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember
$ 498,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_ConsumerPortfolioSegmentMember