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Related Party Transactions (Details) (Executive Officers and Directors [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Executive Officers and Directors [Member]
     
Related Party Transaction [Line Items]      
Deposits from executive officers and directors $ 6,767us-gaap_RelatedPartyDepositLiabilities
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fnrn_LoansToExecutiveOfficersAndDirectorsMember
$ 7,886us-gaap_RelatedPartyDepositLiabilities
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fnrn_LoansToExecutiveOfficersAndDirectorsMember
$ 6,471us-gaap_RelatedPartyDepositLiabilities
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fnrn_LoansToExecutiveOfficersAndDirectorsMember
Loans to executive officers and directors [Roll Forward]      
Outstanding balance, beginning of year 2,250us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fnrn_LoansToExecutiveOfficersAndDirectorsMember
2,086us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fnrn_LoansToExecutiveOfficersAndDirectorsMember
2,331us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fnrn_LoansToExecutiveOfficersAndDirectorsMember
Credit granted 3,651us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fnrn_LoansToExecutiveOfficersAndDirectorsMember
3,956us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fnrn_LoansToExecutiveOfficersAndDirectorsMember
4,025us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fnrn_LoansToExecutiveOfficersAndDirectorsMember
Repayments / Reductions (3,537)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fnrn_LoansToExecutiveOfficersAndDirectorsMember
(3,792)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fnrn_LoansToExecutiveOfficersAndDirectorsMember
(4,270)us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fnrn_LoansToExecutiveOfficersAndDirectorsMember
Outstanding balance, end of year $ 2,364us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fnrn_LoansToExecutiveOfficersAndDirectorsMember
$ 2,250us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fnrn_LoansToExecutiveOfficersAndDirectorsMember
$ 2,086us-gaap_LoansAndLeasesReceivableRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fnrn_LoansToExecutiveOfficersAndDirectorsMember