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Note 19 - Stock-based Compensation - Unrecognized Stock-based Compensation Expense (Details) $ in Thousands | Sep. 30, 2025 USD ($)
--- | ---
Remainder of 2025 | $ 1,023
2026 | 3,299
2027 | 2,930
2028 | 1,238
2029 | 750
2030 | 82
Total estimated future expense | 9,322
Stock Appreciation Rights (SARs) [Member] |
Remainder of 2025 | 113
2026 | 406
2027 | 336
2028 | 246
2029 | 131
2030 | 13
Total estimated future expense | 1,245
Restricted Stock [Member] |
Remainder of 2025 | 486
2026 | 1,683
2027 | 1,385
2028 | 992
2029 | 619
2030 | 69
Total estimated future expense | 5,234
Restricted Stock Units (RSUs) [Member] |
Remainder of 2025 | 122
2026 | 1
2027 | 0
2028 | 0
2029 | 0
2030 | 0
Total estimated future expense | 123
Performance Shares [Member] |
Remainder of 2025 | 302
2026 | 1,209
2027 | 1,209
2028 | 0
2029 | 0
2030 | 0
Total estimated future expense | $ 2,720

X
- Definition Unrecognized cost of unvested share-based compensation awards due in fifth fiscal year following latest fiscal year. + References No definition available. + Details
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Namespace Prefix: | sybt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Unrecognized cost of unvested share-based compensation awards due in fourth fiscal year following latest fiscal year. + References No definition available. + Details
Name: | sybt_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedDueYearFour
Namespace Prefix: | sybt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Unrecognized cost of unvested share-based compensation awards due in third fiscal year following latest fiscal year. + References No definition available. + Details
Name: | sybt_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedDueYearThree
Namespace Prefix: | sybt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Unrecognized cost of unvested share-based compensation awards due in second fiscal year following latest fiscal year. + References No definition available. + Details
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Namespace Prefix: | sybt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Unrecognized cost of unvested share-based compensation awards due next twelve months. + References No definition available. + Details
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Namespace Prefix: | sybt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Unrecognized cost of unvested share-based compensation awards due in remainder of fiscal year following latest fiscal year ended. + References No definition available. + Details
Name: | sybt_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedRemainderOfFiscalYear
Namespace Prefix: | sybt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_StockAppreciationRightsSARSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |