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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 |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Collateral dependent loans | $ 8,191 |  | $ 12,227
Collateral dependent loans, gain (loss) | 10 | $ 4 |
Other real estate owned | 85 |  |
Other real estate owned, gain (loss) | 0 |  |
Fair Value, Inputs, Level 1 [Member] |  |  |
Collateral dependent loans | 0 |  | 0
Other real estate owned | 0 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Collateral dependent loans | 0 |  | 0
Other real estate owned | 0 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |
Collateral dependent loans | 8,191 |  | $ 12,227
Other real estate owned | $ 85 |  |

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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/1943274/2147478524/942-220-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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