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Note 19 - Stock-based Compensation - Unrecognized Stock-based Compensation Expense (Details) $ in Thousands	Mar. 31, 2025 USD ($)
Remainder of 2025	$ 3,381
2026	3,663
2027	2,341
2028	1,242
2029	744
2030	70
Total estimated future expense	11,441
Stock Appreciation Rights (SARs) [Member]
Remainder of 2025	338
2026	406
2027	336
2028	246
2029	131
2030	13
Total estimated future expense	1,470
Restricted Stock [Member]
Remainder of 2025	1,484
2026	1,719
2027	1,405
2028	996
2029	613
2030	57
Total estimated future expense	6,274
Restricted Stock Units (RSUs) [Member]
Remainder of 2025	406
2026	1
2027	0
2028	0
2029	0
2030	0
Total estimated future expense	407
Performance Shares [Member]
Remainder of 2025	1,153
2026	1,537
2027	600
2028	0
2029	0
2030	0
Total estimated future expense	$ 3,290

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

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

Name:	sybt_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedDueYearTwo
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
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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

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Namespace Prefix:
Data Type:	na
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Period Type: