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Fair Value of Financial Instruments, Roll Forward of Level 3 Assets (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Impaired Loans [Member] | PV of future cash flows [Member]    
Quantitative Information about Level 3 Fair Value Measurements [Abstract]    
Fair Value Estimate $ 15,589us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= svbi_ImpairedLoansMember
/ us-gaap_ValuationTechniqueAxis
= svbi_PvOfFutureCashFlowsMember		 $ 15,942us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= svbi_ImpairedLoansMember
/ us-gaap_ValuationTechniqueAxis
= svbi_PvOfFutureCashFlowsMember
Valuation Techniques PV of future cash flows [1] PV of future cash flows [1]
Unobservable Input Discount Rate Discount Rate
Range and weighted average of liquidation expenses (in hundredths) (6.00%)svbi_RangeAndWeightedAverageOfLiquidationExpensesPresentedAsPercentOfAppraisal
/ us-gaap_FairValueByAssetClassAxis
= svbi_ImpairedLoansMember
/ us-gaap_ValuationTechniqueAxis
= svbi_PvOfFutureCashFlowsMember		 (6.00%)svbi_RangeAndWeightedAverageOfLiquidationExpensesPresentedAsPercentOfAppraisal
/ us-gaap_FairValueByAssetClassAxis
= svbi_ImpairedLoansMember
/ us-gaap_ValuationTechniqueAxis
= svbi_PvOfFutureCashFlowsMember
Impaired Loans [Member] | Appraisal of collateral [Member]    
Quantitative Information about Level 3 Fair Value Measurements [Abstract]    
Fair Value Estimate 370us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= svbi_ImpairedLoansMember
/ us-gaap_ValuationTechniqueAxis
= svbi_AppraisalOfCollateralMember		 611us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= svbi_ImpairedLoansMember
/ us-gaap_ValuationTechniqueAxis
= svbi_AppraisalOfCollateralMember
Valuation Techniques Appraisal of collateral [2] Appraisal of collateral [2]
Unobservable Input Liquidation expenses [3] Liquidation expenses [3]
Range and weighted average of liquidation expenses (in hundredths) (6.00%)svbi_RangeAndWeightedAverageOfLiquidationExpensesPresentedAsPercentOfAppraisal
/ us-gaap_FairValueByAssetClassAxis
= svbi_ImpairedLoansMember
/ us-gaap_ValuationTechniqueAxis
= svbi_AppraisalOfCollateralMember		 (6.00%)svbi_RangeAndWeightedAverageOfLiquidationExpensesPresentedAsPercentOfAppraisal
/ us-gaap_FairValueByAssetClassAxis
= svbi_ImpairedLoansMember
/ us-gaap_ValuationTechniqueAxis
= svbi_AppraisalOfCollateralMember
Foreclosed Real Estate [Member] | Appraisal of collateral [Member]    
Quantitative Information about Level 3 Fair Value Measurements [Abstract]    
Fair Value Estimate $ 1,947us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= svbi_ForeclosedRealEstateMember
/ us-gaap_ValuationTechniqueAxis
= svbi_AppraisalOfCollateralMember		 $ 8,972us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByAssetClassAxis
= svbi_ForeclosedRealEstateMember
/ us-gaap_ValuationTechniqueAxis
= svbi_AppraisalOfCollateralMember
Valuation Techniques Appraisal of collateral [2],[4] Appraisal of collateral [2],[4]
Unobservable Input Appraisal adjustments [3] Appraisal adjustments [3]
Minimum [Member] | Foreclosed Real Estate [Member] | Appraisal of collateral [Member]    
Quantitative Information about Level 3 Fair Value Measurements [Abstract]    
Range and weighted average of appraisal adjustments (in hundredths) (6.51%)svbi_RangeAndWeightedAverageOfAppraisalAdjustmentsAsPercentOfAppraisal
/ us-gaap_FairValueByAssetClassAxis
= svbi_ForeclosedRealEstateMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= svbi_AppraisalOfCollateralMember		 (6.00%)svbi_RangeAndWeightedAverageOfAppraisalAdjustmentsAsPercentOfAppraisal
/ us-gaap_FairValueByAssetClassAxis
= svbi_ForeclosedRealEstateMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ValuationTechniqueAxis
= svbi_AppraisalOfCollateralMember
Maximum [Member] | Foreclosed Real Estate [Member] | Appraisal of collateral [Member]    
Quantitative Information about Level 3 Fair Value Measurements [Abstract]    
Range and weighted average of appraisal adjustments (in hundredths) (100.00%)svbi_RangeAndWeightedAverageOfAppraisalAdjustmentsAsPercentOfAppraisal
/ us-gaap_FairValueByAssetClassAxis
= svbi_ForeclosedRealEstateMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= svbi_AppraisalOfCollateralMember		 (44.08%)svbi_RangeAndWeightedAverageOfAppraisalAdjustmentsAsPercentOfAppraisal
/ us-gaap_FairValueByAssetClassAxis
= svbi_ForeclosedRealEstateMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ValuationTechniqueAxis
= svbi_AppraisalOfCollateralMember
Weighted Average [Member] | Foreclosed Real Estate [Member] | Appraisal of collateral [Member]    
Quantitative Information about Level 3 Fair Value Measurements [Abstract]    
Range and weighted average of appraisal adjustments (in hundredths) (13.94%)svbi_RangeAndWeightedAverageOfAppraisalAdjustmentsAsPercentOfAppraisal
/ us-gaap_FairValueByAssetClassAxis
= svbi_ForeclosedRealEstateMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= svbi_AppraisalOfCollateralMember		 (12.69%)svbi_RangeAndWeightedAverageOfAppraisalAdjustmentsAsPercentOfAppraisal
/ us-gaap_FairValueByAssetClassAxis
= svbi_ForeclosedRealEstateMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
/ us-gaap_ValuationTechniqueAxis
= svbi_AppraisalOfCollateralMember
[1] Cash flow which generally include various level 3 inputs which are not identifiable.
[2] Fair value is generally determined through independent appraisals for the underlying collateral, which generally include various level 3 inputs which are not identifiable.
[3] Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range and weighted average of liquidation expenses and other appraisal adjustments are presented as a percent of the appraisal.
[4] Includes qualitative adjustments by management and estimated liquidation expenses.