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Note 16 - Junior Subordinated Debentures (Details) - Consolidated Debt Obligations Related to a Subsidiary Trust Holding (Parentheticals) (London Interbank Offered Rate (LIBOR) [Member])
 3 Months Ended
Mar. 31, 2015
First South Preferred Trust I [Member]  
Note 16 - Junior Subordinated Debentures (Details) - Consolidated Debt Obligations Related to a Subsidiary Trust Holding (Parentheticals) [Line Items]  
LIBOR margin 2.95%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= fsbk_FirstSouthPreferredTrustIMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
Increase First South Preferred Trust I [Member]  
Note 16 - Junior Subordinated Debentures (Details) - Consolidated Debt Obligations Related to a Subsidiary Trust Holding (Parentheticals) [Line Items]  
LIBOR margin 2.95%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= fsbk_IncreaseFirstSouthPreferredTrustIMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember