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Long Term Borrowings (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Long-term advances outstanding $ 115,000,000us-gaap_FederalHomeLoanBankAdvancesLongTerm $ 115,000,000us-gaap_FederalHomeLoanBankAdvancesLongTerm
FHLB of Atlanta [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Credit availability under the FHLB 153,070,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember
162,110,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember
Maximum percentage total assets able to borrow (in hundredths) 20.00%svbi_MaximumPercentageTotalAssetsAbleToBorrow
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember
 
Short-term borrowings with the FHLB 0us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember
0us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember
Long-term advances outstanding 115,000,000us-gaap_FederalHomeLoanBankAdvancesLongTerm
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember
115,000,000us-gaap_FederalHomeLoanBankAdvancesLongTerm
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember
Interest rate on maturities of long-term advances [Abstract]    
2019 Maturity, Rate (in hundredths) 4.00%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateAfterFiveYearsFromBalanceSheetDate
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember
 
Maturities of long-term advances [Abstract]    
2016 Maturity, Amount 15,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromTwoToThreeYearsOfBalanceSheetDate
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember
 
2017 Maturity, Amount 70,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromThreeToFourYearsOfBalanceSheetDate
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember
 
2018 Maturity, Amount 15,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueFromFourToFiveYearsOfBalanceSheetDate
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember
 
2019 Maturity, Amount 15,000,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterFiveYearsOfBalanceSheetDate
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember
 
Long-term advances Maturity, Amount 115,000,000us-gaap_AdvancesFromFederalHomeLoanBanks
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember
 
Loans pledged as collateral $ 261,682,000us-gaap_PledgedAssetsSeparatelyReportedLoansPledgedAsCollateralAtFairValue
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember
 
FHLB of Atlanta [Member] | Minimum [Member]    
Interest rate on maturities of long-term advances [Abstract]    
2016 Maturity, Rate (in hundredths) 1.81%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateTwoToThreeYearsFromBalanceSheetDate
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
2017 Maturity, Rate (in hundredths) 2.43%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateThreeToFourYearsFromBalanceSheetDate
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
2018 Maturity, Rate (in hundredths) 2.58%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateFourToFiveYearsFromBalanceSheetDate
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
FHLB of Atlanta [Member] | Maximum [Member]    
Interest rate on maturities of long-term advances [Abstract]    
2016 Maturity, Rate (in hundredths) 1.83%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateTwoToThreeYearsFromBalanceSheetDate
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
2017 Maturity, Rate (in hundredths) 4.05%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateThreeToFourYearsFromBalanceSheetDate
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
2018 Maturity, Rate (in hundredths) 3.43%us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateFourToFiveYearsFromBalanceSheetDate
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= us-gaap_FederalHomeLoanBankOfAtlantaMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember