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Note 19 - Stock-based Compensation - Unrecognized Stock-based Compensation Expense (Details) $ in Thousands	Dec. 31, 2022 USD ($)
2023	$ 3,053
2024	2,022
2025	879
2026	507
2027	59
Total estimated expense	6,520
Stock Appreciation Rights (SARs) [Member]
2023	315
2024	209
2025	150
2026	92
2027	14
Total estimated expense	780
Restricted Stock [Member]
2023	1,181
2024	959
2025	729
2026	415
2027	45
Total estimated expense	3,329
Restricted Stock Units (RSUs) [Member]
2023	2
2024	0
2025	0
2026	0
2027	0
Total estimated expense	2
Performance Shares [Member]
2023	1,555
2024	854
2025	0
2026	0
2027	0
Total estimated expense	$ 2,409

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

Name:	sybt_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedDueYearFour
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

Name:	sybt_EmployeeServiceSharebasedCompensationNonvestedAwardsCompensationCostNotYetRecognizedDueYearOne
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

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ 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: