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Note 13 - Assets and Liabilities Measured and Reported at Fair Value - Significant Unobservable Inputs (Details) - Impaired Loans [Member] - Fair Value, Inputs, Level 3 [Member] - Appraisal Discount Method [Member] $ in Thousands | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
--- | --- | ---
Collateral dependent loans | $ 11,225 | $ 12,227
Other real estate owned | $ 190 |
Weighted Average [Member] |  |
Impaired Loans, Measurement Input | 0.277 | 0.157
Other Real Estate Owned, Measurement Input | 0.154 |

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- Definition The fair value amount of impaired loans. + References No definition available. + Details
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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
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Namespace Prefix: | sybt_
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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
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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/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
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- Details
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Balance Type: |
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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: |