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Fair Value Of Assets And Liabilities (Qualitative Information About Level 3 Fair Value Measurements) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Impaired Loans [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial Assets $ 1,087us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= sbbx_ImpairedLoansMember
$ 5,483us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= sbbx_ImpairedLoansMember
Valuation Techniques Appraisal of collateral Appraisal of collateral
Unobservable Input Appraisal adjustments [1] Appraisal adjustments [1]
Impaired Loans [Member] | Significant Unobservable Inputs (Level III) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial Assets 1,087us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= sbbx_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
5,483us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= sbbx_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Impaired Loans [Member] | Maximum [Member] | Significant Unobservable Inputs (Level III) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Range (Weighted Average) 0.00%sbbx_FairValueMeasurementsPercentageOfAppraisal
/ us-gaap_FairValueByAssetClassAxis
= sbbx_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
0.00%sbbx_FairValueMeasurementsPercentageOfAppraisal
/ us-gaap_FairValueByAssetClassAxis
= sbbx_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Impaired Loans [Member] | Minimum [Member] | Significant Unobservable Inputs (Level III) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Range (Weighted Average) (66.20%)sbbx_FairValueMeasurementsPercentageOfAppraisal
/ us-gaap_FairValueByAssetClassAxis
= sbbx_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
(67.90%)sbbx_FairValueMeasurementsPercentageOfAppraisal
/ us-gaap_FairValueByAssetClassAxis
= sbbx_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Impaired Loans [Member] | Weighted Average [Member] | Significant Unobservable Inputs (Level III) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Range (Weighted Average) (10.60%)sbbx_FairValueMeasurementsPercentageOfAppraisal
/ us-gaap_FairValueByAssetClassAxis
= sbbx_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
(7.80%)sbbx_FairValueMeasurementsPercentageOfAppraisal
/ us-gaap_FairValueByAssetClassAxis
= sbbx_ImpairedLoansMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
Foreclosed Real Estate [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial Assets 761us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= sbbx_ForeclosedRealEstateMember
1,008us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= sbbx_ForeclosedRealEstateMember
Valuation Techniques Appraisal of collateral Appraisal of collateral
Unobservable Input Selling expenses [1] Selling expenses [1]
Foreclosed Real Estate [Member] | Significant Unobservable Inputs (Level III) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial Assets $ 761us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= sbbx_ForeclosedRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
$ 1,008us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= sbbx_ForeclosedRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Range (Weighted Average) (7.00%)sbbx_FairValueMeasurementsPercentageOfAppraisal
/ us-gaap_FairValueByAssetClassAxis
= sbbx_ForeclosedRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
(7.00%)sbbx_FairValueMeasurementsPercentageOfAppraisal
/ us-gaap_FairValueByAssetClassAxis
= sbbx_ForeclosedRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Foreclosed Real Estate [Member] | Weighted Average [Member] | Significant Unobservable Inputs (Level III) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Range (Weighted Average) (7.00%)sbbx_FairValueMeasurementsPercentageOfAppraisal
/ us-gaap_FairValueByAssetClassAxis
= sbbx_ForeclosedRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
(7.00%)sbbx_FairValueMeasurementsPercentageOfAppraisal
/ us-gaap_FairValueByAssetClassAxis
= sbbx_ForeclosedRealEstateMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
[1] Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated selling expenses. The range and weighted average of selling expenses and other appraisal adjustments are presented as a percent of the appraisal.