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Note 19 - Stock-based Compensation - Unrecognized Stock-based Compensation Expense (Details) $ in Thousands | Sep. 30, 2024 USD ($)
--- | ---
Remainder of 2024 | $ 914
2025 | 2,908
2026 | 2,573
2027 | 1,131
2028 | 611
2029 | 83
Total estimated future expense | 8,220
Stock Appreciation Rights (SARs) [Member] |
Remainder of 2024 | 95
2025 | 336
2026 | 286
2027 | 216
2028 | 126
2029 | 11
Total estimated future expense | 1,070
Restricted Stock [Member] |
Remainder of 2024 | 432
2025 | 1,528
2026 | 1,244
2027 | 915
2028 | 485
2029 | 72
Total estimated future expense | 4,676
Restricted Stock Units (RSUs) [Member] |
Remainder of 2024 | 126
2025 | 1
2026 | 0
2027 | 0
2028 | 0
2029 | 0
Total estimated future expense | 127
Performance Shares [Member] |
Remainder of 2024 | 261
2025 | 1,043
2026 | 1,043
2027 | 0
2028 | 0
2029 | 0
Total estimated future expense | $ 2,347

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
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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 third 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 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
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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: |