Name:	sybt_CapitalConservationBuffer
Namespace Prefix:	sybt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Represents capital required for capital adequacy to risk weighted assets including capital conservation buffer.

No definition available.

Name:	sybt_CapitalRequiredForCapitalAdequacyToRiskWeightedAssetsIncludingCapitalConservationBuffer
Namespace Prefix:	sybt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

The Common Equity Tier 1 capital ratio required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.

No definition available.

Name:	sybt_CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssetsIncludingCapitalConservationBuffer
Namespace Prefix:	sybt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Represents tier one risk based capital required for capital adequacy to risk weighted assets including capital conservation buffer.

No definition available.

Name:	sybt_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssetsIncludingCapitalConservationBuffer
Namespace Prefix:	sybt_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

Minimum capital conservation buffer percentage required to avoid restriction on payout amount of eligible retained income as defined by regulatory framework.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

Name:	us-gaap_BankingRegulationCapitalConservationBufferCapitalConservedMinimum
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

Ratio of minimum Common Equity Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

Name:	us-gaap_BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioWellCapitalizedMinimum
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
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Period Type:	instant

Ratio of minimum total risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

Name:	us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

Ratio of minimum Tier 1 leverage capital to average assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

Name:	us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

Ratio of minimum Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.