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ACQUISITION - Assets Acquired and Liabilities Assumed (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 17, 2014
Business Acquisition [Line Items]      
Goodwill $ 91,372us-gaap_Goodwill $ 22,034us-gaap_Goodwill  
OmniAmerican Bancorp, Inc.      
Business Acquisition [Line Items]      
Cash, cash equivalents, and amounts due from banks     21,214us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= sbsi_OmniAmericanBancorpInc.Member
Other investments     15,698sbsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsOtherInvestments
/ us-gaap_BusinessAcquisitionAxis
= sbsi_OmniAmericanBancorpInc.Member
Securities available for sale     428,447us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities
/ us-gaap_BusinessAcquisitionAxis
= sbsi_OmniAmericanBancorpInc.Member
Loans held for sale     748sbsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsLoansHeldForSale
/ us-gaap_BusinessAcquisitionAxis
= sbsi_OmniAmericanBancorpInc.Member
Loans     763,327sbsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsLoans
/ us-gaap_BusinessAcquisitionAxis
= sbsi_OmniAmericanBancorpInc.Member
Property and equipment     58,928us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= sbsi_OmniAmericanBancorpInc.Member
Bank owned life insurance     44,964sbsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentAssetsBankOwnedLifeInsurance
/ us-gaap_BusinessAcquisitionAxis
= sbsi_OmniAmericanBancorpInc.Member
Other assets     13,409sbsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= sbsi_OmniAmericanBancorpInc.Member
Core deposit intangible     8,570us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= sbsi_OmniAmericanBancorpInc.Member
Goodwill     69,338us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= sbsi_OmniAmericanBancorpInc.Member
Deposits     (801,327)sbsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentLiabilitiesDeposits
/ us-gaap_BusinessAcquisitionAxis
= sbsi_OmniAmericanBancorpInc.Member
Short-term borrowings     (7,000)sbsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentLiabilitiesShorttermBorrowings
/ us-gaap_BusinessAcquisitionAxis
= sbsi_OmniAmericanBancorpInc.Member
Federal Home Loan Bank advances     (308,516)sbsi_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentLiabilitiesFederalHomeLoanBankAdvances
/ us-gaap_BusinessAcquisitionAxis
= sbsi_OmniAmericanBancorpInc.Member
Deferred tax liability, net     (3,244)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= sbsi_OmniAmericanBancorpInc.Member
Other liabilities     (6,246)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= sbsi_OmniAmericanBancorpInc.Member
Fair values of assets acquired and liabilities assumed     $ 298,310us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= sbsi_OmniAmericanBancorpInc.Member