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Regulatory Matters (Details)
Mar. 31, 2015
Dec. 31, 2014
Apr. 23, 2013
Tangible [Abstract]      
Tangible Actual, % (in hundredths) 14.00%us-gaap_TangibleCapitalToTangibleAssets [1] 13.80%us-gaap_TangibleCapitalToTangibleAssets [1]  
Tier I Capital [Abstract]      
Tier I Capital Actual, % (in hundredths) 19.50%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets [2] 19.40%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets [2] 10.00%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
Tier I Capital To Be Well Capitalized Under Prompt Corrective Provisions, % (in hundredths) 8.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets [2]    
Common Equity Tier 1 [Abstract]      
Common Equity Tier I Capital Actual, % (in hundredths) 19.50%svbi_CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets [2]    
Common Equity Tier I Capital To Be Well Capitalized Under Prompt Corrective Provisions, % (in hundredths) 6.50%svbi_CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets [2]    
Core [Abstract]      
Core Actual, % (in hundredths) 14.00%us-gaap_TierOneLeverageCapitalToAverageAssets [1] 13.80%us-gaap_TierOneLeverageCapitalToAverageAssets [1]  
Core To Be Well Capitalized Under Prompt Corrective Action Provisions, % (in hundredths) 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets [1]    
Total Capital [Abstract]      
Total Capital Actual, % (in hundredths) 19.50%us-gaap_CapitalToRiskWeightedAssets [2] 20.60%us-gaap_CapitalToRiskWeightedAssets [2] 15.00%us-gaap_CapitalToRiskWeightedAssets
Total Capital To Be Well Capitalized Under Prompt Corrective Action Provisions, % (in hundredths) 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets [2]    
[1] To adjusted total assets.
[2] To risk-weighted assets.