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Note 20 - Dividends (Details Textual) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
Regulatory Dividend Restrictions, Period Considered for Deduction of Dividend Already Paid for, Net Income (Year)	2 years
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval	$ 110

X

- Definition

Represents the period for which dividend is deducted from net income to determine regulatory dividend restriction.

+ References

No definition available.

+ Details

Name:	sybt_RegulatoryDividendRestrictionsPeriodConsideredForDeductionOfDividendAlreadyPaidForNetIncome
Namespace Prefix:	sybt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of dividends that can be declared or paid without approval of regulatory agency.

+ References

No definition available.

+ Details

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