XML 82 R63.htm IDEA: XBRL DOCUMENT
v3.25.0.1

LOANS AND ALLOWANCE FOR LOAN LOSSES - Aging of Past Due Loans by Class of Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 4,661,597 | $ 4,524,510
Financial Asset, Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 4,650,195 | 4,513,888
30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 8,352 | 7,560
60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,361 | 1,156
Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 689 | 1,906
Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 11,402 | 10,622
Construction real estate loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 537,827 | 789,744
Construction real estate loans | Financial Asset, Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 537,730 | 789,241
Construction real estate loans | 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 92 | 474
Construction real estate loans | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 5 | 0
Construction real estate loans | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 29
Construction real estate loans | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 97 | 503
1-4 family residential real estate loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 740,396 | 696,738
1-4 family residential real estate loans | Financial Asset, Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 735,589 | 689,626
1-4 family residential real estate loans | 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,217 | 4,638
1-4 family residential real estate loans | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,328 | 774
1-4 family residential real estate loans | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 262 | 1,700
1-4 family residential real estate loans | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 4,807 | 7,112
Commercial real estate loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,579,735 | 2,168,451
Commercial real estate loans | Financial Asset, Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,577,350 | 2,167,756
Commercial real estate loans | 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,054 | 621
Commercial real estate loans | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 331 | 34
Commercial real estate loans | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 40
Commercial real estate loans | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,385 | 695
Commercial loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 363,167 | 366,893
Commercial loans | Financial Asset, Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 359,230 | 364,726
Commercial loans | 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,881 | 1,693
Commercial loans | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 649 | 347
Commercial loans | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 407 | 127
Commercial loans | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 3,937 | 2,167
Municipal loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 390,968 | 441,168
Municipal loans | Financial Asset, Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 390,968 | 441,141
Municipal loans | 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 27
Municipal loans | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 0
Municipal loans | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 0
Municipal loans | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 0 | 27
Loans to individuals |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 49,504 | 61,516
Loans to individuals | Financial Asset, Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 49,328 | 61,398
Loans to individuals | 30 to 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 108 | 107
Loans to individuals | 60 to 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 48 | 1
Loans to individuals | Greater than 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 20 | 10
Loans to individuals | Financial Asset, Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 176 | $ 118

X
- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-14 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 80 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-80 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetNotPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=sbsi_MunicipalLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConsumerLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |