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Note 20 - Dividends (Details Textual) $ in Millions | 12 Months Ended
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Dec. 31, 2023 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 | $ 145

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