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Summary of Significant Accounting Policies (Details 2) (Loans, Concentrations of Credit Risk, USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
item
Concentrations of Credit Risk  
Concentration risk threshold, total risk-based capital threshold (as a percent) 25.00%ssb_ConcentrationRiskThresholdPercentage
Concentration risk threshold, total risk-based capital threshold $ 188.9ssb_ConcentrationRiskThresholdAmount
Number of credit concentrations for non-acquired credit impaired loans 4ssb_ConcentrationRiskNumber
Lessors of residential and buildings
 
Concentrations of Credit Risk  
Amount loaned 301.4ssb_ConcentrationRiskAmount
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_FinanceReceivablesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= ssb_LessorsOfResidentialBuildingsMember
Lessors of nonresidential buildings
 
Concentrations of Credit Risk  
Amount loaned 395.1ssb_ConcentrationRiskAmount
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_FinanceReceivablesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= ssb_LessorsOfNonresidentialBuildingsMember
Religious
 
Concentrations of Credit Risk  
Amount loaned 211.0ssb_ConcentrationRiskAmount
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_FinanceReceivablesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= ssb_ReligiousOrganizationsMember
Borrowers engaged in offices of physicians, dentists and other health practitioners
 
Concentrations of Credit Risk  
Amount loaned $ 249.4ssb_ConcentrationRiskAmount
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_FinanceReceivablesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CreditConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= ssb_BorrowersEngagedInOfficesOfPhysiciansDentistsAndOtherHealthPractitionersMember