XML 76 R67.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Off-Balance-Sheet Arrangements, Commitments and Contingencies Narrative (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2021 USD ($) contract | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($)
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Operating lease right-of-use assets obtained in exchange for new operating lease liabilities |  | $ 1,500,000 | $ 240,000 | $ 1,500,000 | $ 1,300,000 |
Lessee, Operating Lease, Number of Contracts | contract | 1 |  |  |  |  |
Operating lease ROU assets |  | 15,610,000 |  | 15,610,000 |  | $ 15,073,000
Unsettled trades to purchase securities |  | 0 | $ (4,433,000) | 0 | $ (4,433,000) | 18,995,000
Unsettled Trades to Sell Securities |  | 0 |  | 0 |  | 0
Unsettled Issuances of Brokered CDs |  | $ 28,481,000 |  | $ 28,481,000 |  | $ 0
Operating lease |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |
Operating lease ROU assets | $ 1,100,000 |  |  |  |  |

X
- Definition Lessee, Operating Lease, Number of Contracts + References No definition available. + Details
Name: | sbsi_LesseeOperatingLeaseNumberofContracts
Namespace Prefix: | sbsi_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI https://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(2) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918686-209980 + Details
Name: | us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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