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Note 19 - Stock-based Compensation - Unrecognized Stock-based Compensation Expense (Details) $ in Thousands | Mar. 31, 2026 USD ($)
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Remainder of 2026 | $ 3,867
2027 | 4,283
2028 | 2,609
2029 | 1,498
2030 | 847
2031 | 75
Total estimated expense | 13,179
Stock Appreciation Rights (SARs) [Member] |
Remainder of 2026 | 394
2027 | 461
2028 | 370
2029 | 255
2030 | 137
2031 | 16
Total estimated expense | 1,633
Restricted Stock [Member] |
Remainder of 2026 | 1,679
2027 | 1,972
2028 | 1,599
2029 | 1,243
2030 | 710
2031 | 59
Total estimated expense | 7,262
Restricted Stock Units (RSUs) [Member] |
Remainder of 2026 | 407
2027 | 1
2028 | 0
2029 | 0
2030 | 0
2031 | 0
Total estimated expense | 408
Performance Shares [Member] |
Remainder of 2026 | 1,387
2027 | 1,849
2028 | 640
2029 | 0
2030 | 0
2031 | 0
Total estimated expense | $ 3,876

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 the first 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_
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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 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: |

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

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

X
- Details
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