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Note 11 - Deposits (Details Textual) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Interest-Bearing Domestic Deposit, Brokered | $ 597,000 | $ 599,000 |
Interest Expense, Time Deposits, 250,000 or More | 5,100,000 | 472,000 | $ 464,000
Related Party Deposit Liabilities | 61,000,000 | 59,000,000 |
Deposit Liabilities Reclassified as Loans Receivable | $ 661,000 | $ 913,000 |

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- Definition Interest expense incurred on time deposits, including certificates of deposits, of $250,000 or more in domestic offices. + References No definition available. + Details
Name: | sybt_InterestExpenseTimeDeposits250000OrMore
Namespace Prefix: | sybt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of deposits held by the entity that have been reclassified as loan balances receivable, for example, but not limited to, overdrafts receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -SubTopic 405 -Topic 942 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481047/942-405-50-1 + Details
Name: | us-gaap_DepositLiabilitiesReclassifiedAsLoansReceivable1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of interest-bearing domestic third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
Name: | us-gaap_InterestBearingDomesticDepositBrokered
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of deposits held by the entity for a related party (entity, shareholder, employee). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(k)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1 + Details
Name: | us-gaap_RelatedPartyDepositLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant