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Note 12 - Securities Sold Under Agreements to Repurchase (Details Textual) - USD ($) $ in Thousands | Mar. 07, 2022 | May 31, 2021
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Commonwealth [Member] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Securities Sold under Repurchase Agreement | $ 66,220 |
Kentucky Bancshares [Member] |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Securities Sold under Repurchase Agreement |  | $ 11,360

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- Definition Amount of securities sold under agreement to repurchase assumed at the acquisition date. + References No definition available. + Details
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Namespace Prefix: | sybt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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