Name:	sybt_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateAmountDueInYearEight
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States the average interest rate applicable to Federal Home Loan Bank advances due eleven years from the balance sheet date.

No definition available.

Name:	sybt_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateAmountDueInYearEleven
Namespace Prefix:	sybt_
Data Type:	num:percentItemType
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Period Type:	instant

States the average interest rate applicable to Federal Home Loan Bank advances due five years from the balance sheet date.

No definition available.

Name:	sybt_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateAmountDueInYearFive
Namespace Prefix:	sybt_
Data Type:	num:percentItemType
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States the average interest rate applicable to Federal Home Loan Bank advances due four years from the balance sheet date.

No definition available.

Name:	sybt_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateAmountDueInYearFour
Namespace Prefix:	sybt_
Data Type:	num:percentItemType
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Period Type:	instant

States the average interest rate applicable to Federal Home Loan Bank advances due nine years from the balance sheet date.

No definition available.

Name:	sybt_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateAmountDueInYearNine
Namespace Prefix:	sybt_
Data Type:	num:percentItemType
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States the average interest rate applicable to Federal Home Loan Bank advances due seven years from the balance sheet date.

No definition available.

Name:	sybt_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateAmountDueInYearSeven
Namespace Prefix:	sybt_
Data Type:	num:percentItemType
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Period Type:	instant

States the average interest rate applicable to Federal Home Loan Bank advances due six years from the balance sheet date.

No definition available.

Name:	sybt_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateAmountDueInYearSix
Namespace Prefix:	sybt_
Data Type:	num:percentItemType
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States the average interest rate applicable to Federal Home Loan Bank advances due ten years from the balance sheet date.

No definition available.

Name:	sybt_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateAmountDueInYearTen
Namespace Prefix:	sybt_
Data Type:	num:percentItemType
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Amount of advances from Federal Home Loan Bank (FHLBank) maturing in five years following the latest fiscal year.

No definition available.

Name:	sybt_FederalHomeLoanBankAdvancesMaturitiesSummaryDueInFiveYearsFromBalanceSheetDate
Namespace Prefix:	sybt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the eighth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	sybt_FederalHomeLoanBankAdvancesMaturitiesSummaryDueInYearEight
Namespace Prefix:	sybt_
Data Type:	xbrli:monetaryItemType
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Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the eleventh fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	sybt_FederalHomeLoanBankAdvancesMaturitiesSummaryDueInYearEleven
Namespace Prefix:	sybt_
Data Type:	xbrli:monetaryItemType
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Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the ninth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	sybt_FederalHomeLoanBankAdvancesMaturitiesSummaryDueInYearNine
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Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the seventh fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	sybt_FederalHomeLoanBankAdvancesMaturitiesSummaryDueInYearSeven
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Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the sixth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	sybt_FederalHomeLoanBankAdvancesMaturitiesSummaryDueInYearSix
Namespace Prefix:	sybt_
Data Type:	xbrli:monetaryItemType
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Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.

Name:	sybt_FederalHomeLoanBankAdvancesMaturitiesSummaryDueInYearTen
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Data Type:	xbrli:monetaryItemType
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Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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Period Type:	instant

States the interest rate applicable to Federal Home Loan Bank advances outstanding as of the Balance Sheet date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Name:	us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresInterestRateAtPeriodEnd
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The weighted average interest rate applicable to the Federal Home Loan Bank advances which are due within one year of the Balance Sheet date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13)(3)(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Name:	us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueWithinOneYearOfBalanceSheetDate
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The weighted average interest rate applicable to the Federal Home Loan Bank advances which are due from one to two years of the Balance Sheet date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13(3)(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Name:	us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOneToTwoYearsFromBalanceSheetDate
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The weighted average interest rate applicable to the Federal Home Loan Bank advances which are due from two to three years of the Balance Sheet date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13(3)(a))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Name:	us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateTwoToThreeYearsFromBalanceSheetDate
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Data Type:	num:percentItemType
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Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

Name:	us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromOneToTwoYearsOfBalanceSheetDate
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Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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

Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

Name:	us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

No definition available.