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Securities (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Schedule Of Available-For-Sale And Held-To-Maturity [Line Items]    
Available for sale securities carrying value pledged to secure public deposits $ 32,800,000sbbx_AvailableForSaleSecuritiesCarryingValue $ 37,200,000sbbx_AvailableForSaleSecuritiesCarryingValue
Gains on sales of securities available for sale 478,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains 407,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Gross losses on sales of securities avaiable for sale 189,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses 14,000us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Fair value of available-for-sale securities 35,332,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue 69,028,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Unrealized loss of available-for-sale securities 396,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss 3,953,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
Fair value of held-to-maturity securities 6,190,000us-gaap_HeldToMaturitySecuritiesFairValue 6,060,000us-gaap_HeldToMaturitySecuritiesFairValue
U.S. Government Agencies [Member]    
Schedule Of Available-For-Sale And Held-To-Maturity [Line Items]    
Number of securities with unrealized losses, available-for-sale 2us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
2us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Fair value of available-for-sale securities 2,905,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
3,246,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Unrealized loss of available-for-sale securities 32,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
49,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
State And Political Subdivisions [Member]    
Schedule Of Available-For-Sale And Held-To-Maturity [Line Items]    
Fair value of available-for-sale securities 13,316,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
25,675,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Unrealized loss of available-for-sale securities 206,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
2,916,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
State And Political Subdivisions [Member] | Available-for-sale Securities [Member]    
Schedule Of Available-For-Sale And Held-To-Maturity [Line Items]    
Number of securities with unrealized losses, available-for-sale 22us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
52us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_AvailableforsaleSecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Number of securities with unrealized losses from state and political subdivisions maturity minimum number of years 10 years  
State And Political Subdivisions [Member] | Held-to-maturity Securities [Member]    
Schedule Of Available-For-Sale And Held-To-Maturity [Line Items]    
Number of securities with unrealized losses from state and political subdivisions maturity minimum number of years 10 years  
Number of securities with unrealized losses, held-to-maturity 2us-gaap_HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
5us-gaap_HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Fair value of held-to-maturity securities 811,000,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
2,900,000us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
Unrealized loss of held-to-maturity securites 5,000us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
92,000us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
/ us-gaap_InformationByCategoryOfDebtSecurityAxis
= us-gaap_HeldtomaturitySecuritiesMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
U.S. Government-Sponsored Enterprises [Member]    
Schedule Of Available-For-Sale And Held-To-Maturity [Line Items]    
Number of securities with unrealized losses, available-for-sale 13us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
32us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Fair value of available-for-sale securities 19,111,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
39,977,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Unrealized loss of available-for-sale securities 158,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
975,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Equity Securities-Financial Services Industry And Other [Member]    
Schedule Of Available-For-Sale And Held-To-Maturity [Line Items]    
Number of securities with unrealized losses, available-for-sale   1us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= sbbx_EquitySecuritiesFinancialServicesIndustryAndOtherMember
Fair value of available-for-sale securities   130,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= sbbx_EquitySecuritiesFinancialServicesIndustryAndOtherMember
Unrealized loss of available-for-sale securities   $ 13,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= sbbx_EquitySecuritiesFinancialServicesIndustryAndOtherMember