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Note 20 - Derivative Financial Instruments (Details Textual) - USD ($) $ in Millions | Sep. 30, 2023 | Aug. 07, 2023 | Feb. 06, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Advance from Federal Home Loan Bank | $ 350 |  |  | $ 50
Three Month Advance Maturing May 2023 [Member] |  |  |  |
Advance from Federal Home Loan Bank | $ 200 | $ 50 | $ 100 |

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 470 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480876/942-470-45-1 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentAxis=sybt_ThreeMonthAdvanceMaturingMay2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |