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Fair Value Of Assets And Liabilities (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Impaired loans, valuation allowance $ 279us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1 $ 485us-gaap_MortgageLoansOnRealEstateWritedownOrReserveAmount1
Impaired Loans [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Impaired loans, fair value $ 1,087us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= sbbx_ImpairedLoansMember
$ 5,483us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= sbbx_ImpairedLoansMember