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Note 13 - Assets and Liabilities Measured and Reported at Fair Value - Significant Unobservable Inputs (Details) - Appraisal Discount Method [Member] - Fair Value, Inputs, Level 3 [Member] - Impaired Loans [Member] $ in Thousands | Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
--- | --- | ---
Collateral dependent loans, fair value | $ 12,141 | $ 20,637
Other real estate owned, fair value | $ 427 | $ 677
Weighted Average [Member] |  |
Impaired Loans, Measurement Input | 0.212 | 0.233
Other Real Estate Owned, Measurement Input | 0.783 | 0.656

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- Definition The fair value amount of impaired loans. + References No definition available. + Details
Name: | sybt_ImpairedLoansFairValue
Namespace Prefix: | sybt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Value of input used to measure impaired loans. + References No definition available. + Details
Name: | sybt_ImpairedLoansMeasurementInput
Namespace Prefix: | sybt_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Definition The fair value related to other real assets owned fair value disclosure. + References No definition available. + Details
Name: | sybt_OtherRealEstateOwnedFairValueDisclosure
Namespace Prefix: | sybt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Value of input used to measure real estate owned by financial institution by financial institution which is not directly related to its business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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

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

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- Details
Name: | us-gaap_FairValueByAssetClassAxis=sybt_ImpairedLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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