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Note 12 - Commitments and Contingent Liabilities (Details Textual) - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Mar. 07, 2022	Dec. 31, 2021
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	$ 500,000	$ (400,000)	$ (550,000)	$ 100,000	$ (825,000)
Standby Letters of Credit [Member] | Minimum [Member]
Guarantee Obligations, Agreement Term (Month)				1 month
Standby Letters of Credit [Member] | Maximum [Member]
Guarantee Obligations, Agreement Term (Month)				2 months
Performance Guarantee [Member]
Guarantee Obligation, Estimated Payment Under Default on Contract	3,000,000			$ 3,000,000
Commonwealth [Member]
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance						$ 500,000
Other Liabilities [Member]
Off-Balance-Sheet, Credit Loss, Liability, Ending Balance	$ 4,100,000			$ 4,100,000			$ 3,500,000

X

- Definition

Represents the amount that the entity would have been required to pay, if an event of default on all contracts had occurred.

+ References

No definition available.

+ Details

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Namespace Prefix:	sybt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Represents the term of agreements entered into by the entity for undertaking guarantee obligation.

+ References

No definition available.

+ Details

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X

- Definition

Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121611286&loc=d3e11927-110247

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82919202-210446

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

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- Details

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- Details

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- Details

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