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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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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

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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
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

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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:
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Period Type:

X

- Details

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