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Loans (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Composition of loans by primary loan classification    
Loans $ 1,874,010us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome $ 1,868,550us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Commercial and industrial    
Composition of loans by primary loan classification    
Loans 594,980us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sybt_CommercialAndIndustrialPortfolioSegmentMember		 588,200us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sybt_CommercialAndIndustrialPortfolioSegmentMember
Construction and development excluding undeveloped land    
Composition of loans by primary loan classification    
Loans 99,846us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sybt_ConstructionAndDevelopmentExcludingUndevelopedLandPortfolioSegmentMember		 95,733us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sybt_ConstructionAndDevelopmentExcludingUndevelopedLandPortfolioSegmentMember
Undeveloped land    
Composition of loans by primary loan classification    
Loans 19,995us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sybt_UndevelopmentLandPortfolioSegmentMember		 21,268us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sybt_UndevelopmentLandPortfolioSegmentMember
Real estate mortgage    
Composition of loans by primary loan classification    
Loans 1,129,941us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sybt_RealEstateMortgagePortfolioSegmentMember		 1,133,953us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sybt_RealEstateMortgagePortfolioSegmentMember
Commercial investment    
Composition of loans by primary loan classification    
Loans 486,371us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sybt_CommercialInvestmentMember		 487,822us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sybt_CommercialInvestmentMember
Owner occupied commercial    
Composition of loans by primary loan classification    
Loans 341,454us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sybt_OwnerOccupiedCommercialMember		 340,982us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sybt_OwnerOccupiedCommercialMember
1-4 family residential    
Composition of loans by primary loan classification    
Loans 191,004us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sybt_OneToFourFamilyResidentialMember		 195,102us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sybt_OneToFourFamilyResidentialMember
Home equity - first lien    
Composition of loans by primary loan classification    
Loans 45,288us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sybt_HomeEquityFirstLienMember		 43,779us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sybt_HomeEquityFirstLienMember
Home equity - junior lien    
Composition of loans by primary loan classification    
Loans 65,824us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sybt_HomeEquityJuniorLienMember		 66,268us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sybt_HomeEquityJuniorLienMember
Consumer    
Composition of loans by primary loan classification    
Loans $ 29,248us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember		 $ 29,396us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerPortfolioSegmentMember