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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings/(Accumulated Deficit) [Member]
Accumulated Other Comprehensive Income/(Loss) [Member]
Total
Balance at Dec. 31, 2011 $ 22,847us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
$ 62,751us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 977us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 864us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 263us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 87,702us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2011 22,847us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
9,144,998us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income       4,646us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  4,646us-gaap_NetIncomeLoss
Other comprehensive income (Loss), net of tax         911us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
911us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Stock dividend   451us-gaap_DividendsCommonStockStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  (451)us-gaap_DividendsCommonStockStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  0us-gaap_DividendsCommonStockStock
Stock dividend (in shares)   91,052us-gaap_CommonStockDividendsShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Dividend on preferred stock       (1,139)us-gaap_DividendsPreferredStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  (1,139)us-gaap_DividendsPreferredStockCash
Cash in lieu of fractional shares       (3)fnrn_CashPaidInLieuOfFractionalShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  (3)fnrn_CashPaidInLieuOfFractionalShares
Stock-based compensation and related tax benefits   115fnrn_StockBasedCompensationAndRelatedTaxBenefits
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      115fnrn_StockBasedCompensationAndRelatedTaxBenefits
Common shares issued   93us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      93us-gaap_StockIssuedDuringPeriodValueNewIssues
Common shares issued (in shares)   36,618us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Balance at Dec. 31, 2012 22,847us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
63,410us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
977us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
3,917us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
1,174us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
92,325us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2012 22,847us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
9,272,668us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income       5,384us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  5,384us-gaap_NetIncomeLoss
Other comprehensive income (Loss), net of tax         (2,247)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(2,247)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Redemption of preferred stock (10,000)us-gaap_StockRedeemedOrCalledDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
        (10,000)us-gaap_StockRedeemedOrCalledDuringPeriodValue
Redemption of preferred stock (in shares) (10,000)us-gaap_StockRedeemedOrCalledDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
         
Stock dividend   1,047us-gaap_DividendsCommonStockStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  (1,047)us-gaap_DividendsCommonStockStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  0us-gaap_DividendsCommonStockStock
Stock dividend (in shares)   185,291us-gaap_CommonStockDividendsShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Dividend on preferred stock       (677)us-gaap_DividendsPreferredStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  (677)us-gaap_DividendsPreferredStockCash
Cash in lieu of fractional shares       (4)fnrn_CashPaidInLieuOfFractionalShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  (4)fnrn_CashPaidInLieuOfFractionalShares
Cash in lieu of fractional shares (in shares)   (159)fnrn_CashPaidInLieuOfFractionalSharesStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Stock-based compensation and related tax benefits   157fnrn_StockBasedCompensationAndRelatedTaxBenefits
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      157fnrn_StockBasedCompensationAndRelatedTaxBenefits
Tax deficiency related to expired, vested non-qualified stock options   (106)fnrn_TaxDeficiencyRelatedToExpiredVestedNonQualifiedStockOptions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      (106)fnrn_TaxDeficiencyRelatedToExpiredVestedNonQualifiedStockOptions
Common shares issued   76us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      76us-gaap_StockIssuedDuringPeriodValueNewIssues
Common shares issued (in shares)   37,874us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Balance at Dec. 31, 2013 12,847us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
64,584us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
977us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
7,573us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(1,073)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
84,908us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2013 12,847us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
9,495,674us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income       5,870us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  5,870us-gaap_NetIncomeLoss
Other comprehensive income (Loss), net of tax         1,139us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
1,139us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Stock dividend   2,065us-gaap_DividendsCommonStockStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  (2,065)us-gaap_DividendsCommonStockStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  0us-gaap_DividendsCommonStockStock
Stock dividend (in shares)   284,871us-gaap_CommonStockDividendsShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Stock dividend declared in 2015   3,097fnrn_CommonStockDividend
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  (3,097)fnrn_CommonStockDividend
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  0fnrn_CommonStockDividend
Stock dividend declared in 2015 (in shares)   392,578fnrn_CommonStockDividendShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Dividend on preferred stock       (129)us-gaap_DividendsPreferredStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  (129)us-gaap_DividendsPreferredStockCash
Cash in lieu of fractional shares       (6)fnrn_CashPaidInLieuOfFractionalShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  (6)fnrn_CashPaidInLieuOfFractionalShares
Cash in lieu of fractional shares (in shares)   (145)fnrn_CashPaidInLieuOfFractionalSharesStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Stock-based compensation and related tax benefits   185fnrn_StockBasedCompensationAndRelatedTaxBenefits
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      185fnrn_StockBasedCompensationAndRelatedTaxBenefits
Common shares issued   84us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      84us-gaap_StockIssuedDuringPeriodValueNewIssues
Common shares issued (in shares)   38,175us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Restricted stock forfeited           0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures
Restricted stock forfeited (in shares)   (4,110)us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Balance at Dec. 31, 2014 $ 12,847us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
$ 70,015us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 977us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 8,146us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 66us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 92,051us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2014 12,847us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
10,207,043us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember