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OFF-BALANCE-SHEET ARRANGEMENTS, COMMITMENTS AND CONTINGENCIES - Narrative (Details) - USD ($) | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Securities |  |  |
Unsettled trades to purchase securities | $ 0 | $ 0 | $ 0
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
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration