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Securities (Amortized Cost And Fair Value Of Securities By Contractual Maturity Of Available-For-Sale Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Due after five years through ten years, Amortized Cost $ 1,369us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost  
Due after ten years, Amortized Cost 25,063us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost  
Total bonds and obligations, Amortized Cost 26,432us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis  
Due after five years through ten years, Fair Value 1,385us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue  
Due after ten years, Fair Value 24,999us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue  
Total bonds and obligations, Fair Value 26,384us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue  
Amortized Cost 77,695us-gaap_AvailableForSaleSecuritiesAmortizedCost 94,261us-gaap_AvailableForSaleSecuritiesAmortizedCost
Fair Value 77,976us-gaap_AvailableForSaleSecurities 90,676us-gaap_AvailableForSaleSecurities
U.S. Government Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 7,873us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
5,421us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Fair Value 7,858us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
5,380us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
U.S. Government-Sponsored Enterprises [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 43,382us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
59,640us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Fair Value 43,724us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
58,937us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Equity Securities-Financial Services Industry And Other [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 8us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= sbbx_EquitySecuritiesFinancialServicesIndustryAndOtherMember
412us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= sbbx_EquitySecuritiesFinancialServicesIndustryAndOtherMember
Fair Value $ 10us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= sbbx_EquitySecuritiesFinancialServicesIndustryAndOtherMember
$ 484us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= sbbx_EquitySecuritiesFinancialServicesIndustryAndOtherMember