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Note 24 - Leases (Details Textual) | 6 Months Ended
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Jun. 30, 2022
Lessee, Operating Lease, Renewal Term (Year) | 5 years
Commonwealth [Member] |
Number of Operating Leases Added in Acquisition | 4
Minimum [Member] |
Operating Lease, Remaining Lease Term (Year) | 1 year
Maximum [Member] |
Operating Lease, Remaining Lease Term (Year) | 18 years

X
- Definition Represents the number of operating leases added in an acquisition. + References No definition available. + Details
Name: | sybt_NumberOfOperatingLeasesAddedInAcquisition
Namespace Prefix: | sybt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the remaining lease term of operating leases. + References No definition available. + Details
Name: | sybt_OperatingLeaseRemainingLeaseTerm
Namespace Prefix: | sybt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseRenewalTerm
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=sybt_CommonwealthMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |