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Note 13 - Commitments and Contingent Liabilities (Details Textual) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Standby Letters of Credit [Member] | Minimum [Member] |  |
Guarantee Obligations, Agreement Term (Month) | 1 month |
Standby Letters of Credit [Member] | Maximum [Member] |  |
Guarantee Obligations, Agreement Term (Month) | 2 months |
Performance Guarantee [Member] |  |
Guarantee Obligation, Estimated Payment Under Default on Contract | $ 3.0 |
Other Liabilities [Member] |  |
Off-Balance-Sheet, Credit Loss, Liability | $ 4.9 | $ 4.5

X
- Definition Represents the amount that the entity would have been required to pay, if an event of default on all contracts had occurred. + References No definition available. + Details
Name: | sybt_GuaranteeObligationEstimatedPaymentUnderDefaultOnContract
Namespace Prefix: | sybt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the term of agreements entered into by the entity for undertaking guarantee obligation. + References No definition available. + Details
Name: | sybt_GuaranteeObligationsAgreementTerm
Namespace Prefix: | sybt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482454/460-10-45-1 + Details
Name: | us-gaap_OffBalanceSheetCreditLossLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_PerformanceGuaranteeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |