Name:	sybt_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndSarsExercisableIntrinsicValue
Namespace Prefix:	sybt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The exercise price for purposes of disclosing shares potentially issuable under outstanding stock option awards and stock appreciation rights under the plans.

No definition available.

Name:	sybt_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndSarsExercisePrice
Namespace Prefix:	sybt_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Amount of difference between the fair value of the underlying shares on dates of exercise and exercise price of forfeited stock options and stock appreciation rights.

No definition available.

Name:	sybt_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndSarsForfeitedIntrinsicValue
Namespace Prefix:	sybt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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Amount of difference between the fair value of the underlying shares and exercise price of stock options and stock appreciation rights granted during the period.

No definition available.

Name:	sybt_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndSarsGrantedInPeriodIntrinsicValue
Namespace Prefix:	sybt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The number of shares reserved for issuance under stock option agreements and stock appreciation rights agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

No definition available.

Name:	sybt_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndSarsOutstandingNumber
Namespace Prefix:	sybt_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

The weighted average fair value of shares reserved for issuance under stock option and stock appreciation right agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including unvested stock options and stock appreciation rights.

No definition available.

Name:	sybt_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndSarsOutstandingWeightedAverageGrantDateFairValue
Namespace Prefix:	sybt_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

The weighted average period between the balance sheet date and expiration date of all awards outstanding under the plans.

No definition available.

Name:	sybt_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndSarsOutstandingWeightedAverageRemainingContractualTerm
Namespace Prefix:	sybt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of unvested stock options and stock appreciation rights outstanding as of the balance sheet date.

No definition available.

Name:	sybt_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndSarsUnvestedAggregateIntrinsicValue
Namespace Prefix:	sybt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options and stock appreciation rights outstanding and currently exercisable as of the balance sheet date.

No definition available.

Name:	sybt_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndSarsVestedAndExercisableAggregateIntrinsicValue
Namespace Prefix:	sybt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options and stock appreciation rights outstanding under the plan as of the balance sheet date.

No definition available.

Name:	sybt_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndSarsVestedAndExercisableOutstandingAggregateIntrinsicValue
Namespace Prefix:	sybt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of difference between the fair value of the underlying shares and exercise price of stock options and stock appreciation rights vested during the period.

No definition available.

Name:	sybt_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsAndSarsVestedInPeriodAggregateIntrinsicValue
Namespace Prefix:	sybt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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Data Type:	na
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Name:	us-gaap_AwardTypeAxis=sybt_AwardOutstandingMember
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Data Type:	na
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Name:	us-gaap_AwardTypeAxis=sybt_AwardGrantedMember
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Data Type:	na
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Data Type:	na
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