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Employee Benefit Plans Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Noncash adjustment to employee benefit plan liabilities, consisting of changes in net loss	$ 173	$ 206

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

X

- 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