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Derivative Financial Instruments (Details) (Undesignated, USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Receiving    
Derivative financial instruments    
Notional amount $ 7,052invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sybt_InterestRateSwapOneMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 $ 7,217invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sybt_InterestRateSwapOneMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Weighted average maturity 6 years 6 months 6 years 9 months 18 days
Fair value (321)us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= sybt_InterestRateSwapOneMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 (401)us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= sybt_InterestRateSwapOneMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Paying    
Derivative financial instruments    
Notional amount 7,052invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sybt_InterestRateSwapTwoMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 7,217invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= sybt_InterestRateSwapTwoMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
Weighted average maturity 6 years 6 months 6 years 9 months 18 days
Fair value $ 321us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= sybt_InterestRateSwapTwoMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 $ 401us-gaap_DerivativeFairValueOfDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= sybt_InterestRateSwapTwoMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember