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Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Net income $ 725,077us-gaap_NetIncomeLoss $ 1,102,002us-gaap_NetIncomeLoss
Unrealized holding gains on securities available for sale 2,054,282us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax 2,462,657us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Tax effect (750,909)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax (935,809)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Unrealized holding gains on securities available for sale,    
net of tax 1,303,373us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 1,526,848us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Reclassification adjustment for realized gains included in net income (250,781)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax (13,509)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Tax effect 65,579us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax 5,133us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Reclassification adjustment for realized gains, net of tax (185,202)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax (8,376)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Other comprehensive income, net of tax 1,052,977us-gaap_OtherComprehensiveIncomeLossNetOfTax 1,450,536us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income 1,778,054us-gaap_ComprehensiveIncomeNetOfTax 2,552,538us-gaap_ComprehensiveIncomeNetOfTax
Interest Rate Hedge [Member]    
Unrealized holding gains on securities available for sale,    
Unrealized losses on interest rate hedge position (103,977)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= fsbk_InterestRateHedgeMember
(109,573)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= fsbk_InterestRateHedgeMember
Tax effect 38,783us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= fsbk_InterestRateHedgeMember
41,637us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= fsbk_InterestRateHedgeMember
Unrealized losses on interest rate hedge position, net of tax $ (65,194)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= fsbk_InterestRateHedgeMember
$ (67,936)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= fsbk_InterestRateHedgeMember