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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other comprehensive income (loss), net of tax:      
Unrealized holding gains (losses) on securities arising during the current period, tax $ 912us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax $ (1,646)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax $ 722us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Reclassification adjustment due to gains realized on sales of securities, tax (19)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax (2)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax (3)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Officers' retirement plan equity adjustments, tax (132)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax 125us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax (110)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Directors' retirement plan equity adjustments, tax (3)fnrn_OtherComprehensiveIncomeLossDirectorsPensionAndOtherPostretirementBenefitPlansTax 25fnrn_OtherComprehensiveIncomeLossDirectorsPensionAndOtherPostretirementBenefitPlansTax 0fnrn_OtherComprehensiveIncomeLossDirectorsPensionAndOtherPostretirementBenefitPlansTax
Total other comprehensive income (loss), tax $ 758us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 $ (1,498)us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1 $ 609us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1