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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

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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

Name:	sybt_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedNextTwelveMonths
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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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: