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Note 10 - Subordinated Debentures (Details Textual) | Mar. 07, 2022
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Commonwealth [Member] |
Business Acquisition, Percentage of Voting Interests Acquired | 100.00%

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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479328/805-10-50-2 + Details
Name: | us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=sybt_CommonwealthMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |