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Employee Benefit Plans Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items] |  |
Noncash adjustment to employee benefit plan liabilities, consisting of changes in net loss | $ 567 | $ 671

X
- Definition Adjustment to pension liability during the period related to benefit plans, before tax. + References No definition available. + Details
Name: | sbsi_AdjustmentToPensionLiability
Namespace Prefix: | sbsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration