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Fair Value (Assets Measured at Fair Value on Nonrecurring Basis) (Detail) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure, nonrecurring $ 11,232,000us-gaap_AssetsFairValueDisclosureNonrecurring $ 11,014,000us-gaap_AssetsFairValueDisclosureNonrecurring
Fair value measured on nonrecurring basis losses 15,359,000sasr_FairValueMeasuredOnNonrecurringBasisLosses 13,646,000sasr_FairValueMeasuredOnNonrecurringBasisLosses
Impaired loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure, nonrecurring 8,005,000us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= sasr_ImpairedLoansMember
7,819,000us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= sasr_ImpairedLoansMember
Fair value measured on nonrecurring basis losses 15,606,000sasr_FairValueMeasuredOnNonrecurringBasisLosses
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= sasr_ImpairedLoansMember
13,893,000sasr_FairValueMeasuredOnNonrecurringBasisLosses
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= sasr_ImpairedLoansMember
Other real estate owned    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure, nonrecurring 3,227,000us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= sasr_OtherRealEstateOwnedMember
3,195,000us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= sasr_OtherRealEstateOwnedMember
Fair value measured on nonrecurring basis losses (247,000)sasr_FairValueMeasuredOnNonrecurringBasisLosses
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= sasr_OtherRealEstateOwnedMember
(247,000)sasr_FairValueMeasuredOnNonrecurringBasisLosses
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= sasr_OtherRealEstateOwnedMember
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure, nonrecurring 0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Quoted Prices in Active Markets for Identical Assets (Level 1) | Impaired loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure, nonrecurring 0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= sasr_ImpairedLoansMember
0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= sasr_ImpairedLoansMember
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other real estate owned    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure, nonrecurring 0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= sasr_OtherRealEstateOwnedMember
0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= sasr_OtherRealEstateOwnedMember
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure, nonrecurring 0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Significant Other Observable Inputs (Level 2) | Impaired loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure, nonrecurring 0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= sasr_ImpairedLoansMember
0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= sasr_ImpairedLoansMember
Significant Other Observable Inputs (Level 2) | Other real estate owned    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure, nonrecurring 0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= sasr_OtherRealEstateOwnedMember
0us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= sasr_OtherRealEstateOwnedMember
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure, nonrecurring 11,232,000us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
11,014,000us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Significant Unobservable Inputs (Level 3) | Impaired loans    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure, nonrecurring 8,005,000us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= sasr_ImpairedLoansMember
7,819,000us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= sasr_ImpairedLoansMember
Significant Unobservable Inputs (Level 3) | Other real estate owned    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, fair value disclosure, nonrecurring $ 3,227,000us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= sasr_OtherRealEstateOwnedMember
$ 3,195,000us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis
= sasr_OtherRealEstateOwnedMember