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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) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
Collateral dependent loans, fair value | $ 0 | $ 0 | $ 0
Collateral dependent loans | 0 | 0 | 0
Other real estate owned, fair value | 0 | 0 | 0
Other real estate owned, gain (loss) | 0 | 0 | 0
Fair Value, Inputs, Level 1 [Member] |  |  |
Collateral dependent loans, fair value | 0 | 0 | 0
Other real estate owned, fair value | 0 | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |  |
Collateral dependent loans, fair value | 10,380 | 10,380 | 20,637
Other real estate owned, fair value | 0 | 0 | 677
Fair Value, Inputs, Level 3 [Member] |  |  |
Collateral dependent loans, fair value | 10,380 | 10,380 | 20,637
Other real estate owned, fair value | $ 0 | $ 0 | $ 677

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- Definition The amount of gains (losses) on collateral dependent loans. + References No definition available. + Details
Name: | sybt_GainsLossesOnCollateralDependentLoans
Namespace Prefix: | sybt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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

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- 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

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- 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//1943274/2147483589/942-220-S99-1 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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- Details
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- Details
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Data Type: | na
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- Details
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Data Type: | na
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