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Note 25 - Interest Rate Swaps (Details Textual) - USD ($) $ in Millions	Dec. 31, 2023	Aug. 07, 2023	Feb. 06, 2023	Dec. 31, 2022
Advance from Federal Home Loan Bank	$ 200			$ 50
Three Month Advance Maturing May 2023 [Member]
Advance from Federal Home Loan Bank		$ 50	$ 100

X

- Definition

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 470
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480876/942-470-45-1

+ Details

Name:	us-gaap_AdvancesFromFederalHomeLoanBanks
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_DebtInstrumentAxis=sybt_ThreeMonthAdvanceMaturingMay2023Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: