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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (UNAUDITED) (USD $)
In Thousands, except Share data
Preferred Stock [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Total
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
       
Net income       1,517us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  1,517us-gaap_NetIncomeLoss
Other comprehensive income         342us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
342us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Stock dividend adjustment   6us-gaap_DividendsCommonStockStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  (6)us-gaap_DividendsCommonStockStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  0us-gaap_DividendsCommonStockStock
Sock dividend adjustment (in shares)   682us-gaap_CommonStockDividendsShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Dividend on preferred stock       (32)us-gaap_DividendsPreferredStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
  (32)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)   (128)fnrn_CashPaidInLieuOfFractionalSharesStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Stock-based compensation and related tax benefit   58fnrn_StockBasedCompensationAndRelatedTaxBenefits
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      58fnrn_StockBasedCompensationAndRelatedTaxBenefits
Common shares issued related to restricted stock grants, net           0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
Common shares issued related to restricted stock grants, net (in shares)   28,901us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Stock options exercised   84us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      84us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Stock options exercised (in shares)   19,721us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
       
Balance at Mar. 31, 2015 $ 12,847us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
$ 70,163us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 977us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ 9,619us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 408us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 94,014us-gaap_StockholdersEquity
Balance (in shares) at Mar. 31, 2015 12,847us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_PreferredStockMember
10,256,219us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember