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Note 13 - Assets and Liabilities Measured and Reported at Fair Value - Assets Measured at Fair Value on a Non-recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2025	Dec. 31, 2024
Other real estate owned, gain (loss)			$ 31	$ (0)
Fair Value, Nonrecurring [Member]
Collateral dependent loans					$ 11,225	$ 12,227
Gains (Losses) on Collateral Dependent Loans	$ 24	$ 245
Other real estate owned					190
Other real estate owned, gain (loss)	$ 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 1 [Member]
Collateral dependent loans					0	0
Gains (Losses) on Collateral Dependent Loans			24	$ 245
Other real estate owned					0
Other real estate owned, gain (loss)			$ 0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Collateral dependent loans					0	0
Other real estate owned					0
Fair Value, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Collateral dependent loans					11,225	$ 12,227
Other real estate owned					$ 190

X

- Definition

The amount of gains (losses) on collateral dependent loans.

+ References

No definition available.

+ Details

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

X

- Definition

The fair value amount of impaired loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	sybt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(14)(d))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1

+ Details

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X

- Details

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- Details

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- Details

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