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Fair Value Of Financial Instruments (Narrative) (Details) (Impaired Loans [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Impaired Loans [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Impaired loans, fair value $ 1,784us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= sbbx_ImpairedLoansMember
$ 1,087us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= sbbx_ImpairedLoansMember