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Note 19 - Stock-based Compensation - Unrecognized Stock-based Compensation Expense (Details) $ in Thousands | Sep. 30, 2023 USD ($)
--- | ---
Remainder of 2023 | $ 1,016
2024 | 2,603
2025 | 1,896
2026 | 1,049
2027 | 615
2028 | 54
Total estimated future expense | 7,233
Stock Appreciation Rights (SARs) [Member] |
Remainder of 2023 | 91
2024 | 307
2025 | 248
2026 | 190
2027 | 111
2028 | 12
Total estimated future expense | 959
Restricted Stock [Member] |
Remainder of 2023 | 398
2024 | 1,385
2025 | 1,163
2026 | 859
2027 | 504
2028 | 42
Total estimated future expense | 4,351
Restricted Stock Units (RSUs) [Member] |
Remainder of 2023 | 125
2024 | 3
2025 | 0
2026 | 0
2027 | 0
2028 | 0
Total estimated future expense | 128
Performance Shares [Member] |
Remainder of 2023 | 402
2024 | 908
2025 | 485
2026 | 0
2027 | 0
2028 | 0
Total estimated future expense | $ 1,795

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

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