XML 79 R66.htm IDEA: XBRL DOCUMENT
v3.24.0.1

DEPOSITS - Types and Components of Deposit Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Noninterest bearing demand deposits: |  |
Noninterest bearing demand deposits | $ 1,390,407 | $ 1,671,562
Interest bearing deposits: |  |
Total interest bearing deposits | 5,159,274 | 4,526,457
Total deposits | 6,549,681 | 6,198,019
Private accounts |  |
Noninterest bearing demand deposits: |  |
Noninterest bearing demand deposits | 1,322,793 | 1,607,952
Interest bearing deposits: |  |
Savings accounts | 602,050 | 672,676
Money market demand accounts | 356,506 | 424,676
Platinum money market accounts | 421,505 | 421,826
Interest bearing checking accounts | 1,897,017 | 1,496,784
NOW demand accounts | 14,507 | 13,601
CDs of $250,000 or more | 232,343 | 120,387
CDs under $250,000 | 489,584 | 532,409
Total interest bearing deposits | 4,013,512 | 3,682,359
Public accounts |  |
Noninterest bearing demand deposits: |  |
Noninterest bearing demand deposits | 67,614 | 63,610
Interest bearing deposits: |  |
Savings accounts | 2,000 | 1,949
Money market demand accounts | 31,808 | 33,871
Platinum money market accounts | 498,079 | 365,720
Interest bearing checking accounts | 75,573 | 89,320
NOW demand accounts | 370,752 | 234,027
CDs of $250,000 or more | 161,194 | 113,810
CDs under $250,000 | 6,356 | 5,401
Total interest bearing deposits | $ 1,145,762 | $ 844,098

X
- Definition Certificates and TIme Deposits, $250,000 or more, Domestic + References No definition available. + Details
Name: | sbsi_Certificatesandothertimedeposits250000ormore
Namespace Prefix: | sbsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Interest-bearing Domestic Deposit, Money Market, Platinum + References No definition available. + Details
Name: | sbsi_InterestBearingDomesticDepositMoneyMarketPlatinum
Namespace Prefix: | sbsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Time Deposits, Less than $250,000, Domestic + References No definition available. + Details
Name: | sbsi_TimeDepositsLessthan250000Domestic
Namespace Prefix: | sbsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
Name: | us-gaap_Deposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Total amount of interest-bearing domestic deposit liabilities, which may include brokered, retail, demand, checking, notice of withdrawal, money market and other interest-bearing deposits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
Name: | us-gaap_InterestBearingDepositLiabilitiesDomestic
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of interest-bearing domestic checking deposit liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
Name: | us-gaap_InterestBearingDomesticDepositChecking
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of interest-bearing domestic money market demand account deposit liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
Name: | us-gaap_InterestBearingDomesticDepositMoneyMarket
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of interest-bearing domestic negotiable order of withdrawal (NOW) demand deposit liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
Name: | us-gaap_InterestBearingDomesticDepositNegotiableOrderOfWithdrawalNOW
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of interest-bearing domestic savings deposit liabilities. Saving deposits bear interest and have no stated maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
Name: | us-gaap_InterestBearingDomesticDepositSavings
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Amount of domestic noninterest-bearing deposits held by the entity, which may include demand deposits, checking, brokered and retail deposits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
Name: | us-gaap_NoninterestBearingDepositLiabilitiesDomestic
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | sbsi_DepositsByCustomerAlternativeAxis=sbsi_PrivateAccountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | sbsi_DepositsByCustomerAlternativeAxis=sbsi_PublicAccountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |