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Commitments and Contingent Liabilities (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Commitments to extend credit and standby letters of credit    
Commitments and contingent liabilities    
The amount of commitments made by the entity 492.3us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_OtherCommitmentsAxis
= sybt_CommitmentsToExtendCreditAndStandbyLettersOfCreditMember		 $ 463.0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_OtherCommitmentsAxis
= sybt_CommitmentsToExtendCreditAndStandbyLettersOfCreditMember
Standby letters of credit    
Commitments and contingent liabilities    
The amount of commitments made by the entity 11.7us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_OtherCommitmentsAxis
= us-gaap_StandbyLettersOfCreditMember		 $ 11.0us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountLiability
/ us-gaap_OtherCommitmentsAxis
= us-gaap_StandbyLettersOfCreditMember
Standby letters of credit | Minimum    
Commitments and contingent liabilities    
Term of the guarantee agreements 1 year  
Standby letters of credit | Maximum    
Commitments and contingent liabilities    
Term of the guarantee agreements 2 years