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OFF-BALANCE-SHEET ARRANGEMENTS, COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Securities
Unsettled trades to purchase securities	$ 0	$ 0	$ 18,995,000
Unsettled trades to sell securities	0	0
Deposits [Abstract]
Unsettled issuances of brokered CDs	$ 0	$ 0

X

- Definition

Amount of brokered CDs sold that were not settled by the end of the period. The amount recorded is the selling price including any accrued interest.

+ References

No definition available.

+ Details

Name:	sbsi_UnsettledIssuancesofBrokeredCDs
Namespace Prefix:	sbsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of securities purchased that were not settled by the end of the period. The amount recorded is the purchase price including any accrued interest. This asset is collected upon delivery of the securities.

+ References

No definition available.

+ Details

Name:	sbsi_UnsettledTradesToPurchaseSecuritiesLiability
Namespace Prefix:	sbsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of securities sold that were not settled by the end of the period. The amount recorded is the selling price including any accrued interest. This asset is collected upon delivery of the securities.

+ References

No definition available.

+ Details

Name:	sbsi_UnsettledTradesToSellSecurities
Namespace Prefix:	sbsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleAndHeldToMaturityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_DepositsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration