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Note 13 - Assets and Liabilities Measured and Reported at Fair Value - Significant Unobservable Inputs (Details) - Impaired Loans [Member] - Fair Value, Inputs, Level 3 [Member] - Appraisal Discount Method [Member] $ in Thousands	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Collateral dependent loans	$ 8,234	$ 13,561
Other real estate owned	$ 10	$ 10
Weighted Average [Member]
Impaired Loans, Measurement Input	0.194	0.18
Other Real Estate Owned, Measurement Input	0.93	0.93

X

- Definition

The fair value amount of impaired loans.

+ References

No definition available.

+ Details

Name:	sybt_ImpairedLoansFairValue
Namespace Prefix:	sybt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Value of input used to measure impaired loans.

+ References

No definition available.

+ Details

Name:	sybt_ImpairedLoansMeasurementInput
Namespace Prefix:	sybt_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The fair value related to other real assets owned fair value disclosure.

+ References

No definition available.

+ Details

Name:	sybt_OtherRealEstateOwnedFairValueDisclosure
Namespace Prefix:	sybt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Value of input used to measure real estate owned by financial institution by financial institution which is not directly related to its business.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_OtherRealEstateOwnedMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=sybt_ImpairedLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ValuationTechniqueAxis=sybt_AppraisalDiscountMethodMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: