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Summary of Significant Accounting Policies - Estimated Useful Lives for Various Asset (Details) | 12 Months Ended
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Dec. 31, 2022
Buildings |
Property, Plant and Equipment [Line Items] |
Estimated useful lives | 25 years
Furniture and Fixtures |
Property, Plant and Equipment [Line Items] |
Estimated useful lives | 5 years
Computer Equipment and Software |
Property, Plant and Equipment [Line Items] |
Estimated useful lives | 5 years
Other Equipment |
Property, Plant and Equipment [Line Items] |
Estimated useful lives | 5 years
Vehicles |
Property, Plant and Equipment [Line Items] |
Estimated useful lives | 5 years
Leasehold improvements |
Property, Plant and Equipment [Line Items] |
Estimated useful lives | 15 years

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=stba_ComputerEquipmentAndSoftwareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=stba_OtherEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |