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Fair Value (Carrying Amounts and Fair Values of Company's Financial Instruments) (Detail) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Financial Liabilities    
Securities sold under retail repurchase agreements and federal funds purchased $ 101,640,000us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase $ 74,432,000us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase
Advances from FHLB 590,000,000us-gaap_FederalHomeLoanBankAdvancesLongTerm 655,000,000us-gaap_FederalHomeLoanBankAdvancesLongTerm
Subordinated debentures 35,000,000us-gaap_SubordinatedDebt 35,000,000us-gaap_SubordinatedDebt
Reported Value Measurement [Member]    
Financial Assets    
Investments held-to-maturity and other equity securities 254,856,000sasr_OtherHeldToMaturitySecuritiesAndOtherEquitySecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
261,410,000sasr_OtherHeldToMaturitySecuritiesAndOtherEquitySecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Loans, net of allowance 3,127,231,000us-gaap_LoansReceivableNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
3,089,590,000us-gaap_LoansReceivableNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Other assets 89,011,000us-gaap_InterestReceivableAndOtherAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
88,657,000us-gaap_InterestReceivableAndOtherAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Financial Liabilities    
Time Deposits 450,747,000us-gaap_TimeDeposits
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
444,922,000us-gaap_TimeDeposits
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Securities sold under retail repurchase agreements and federal funds purchased 101,640,000us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
74,432,000us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Advances from FHLB 590,000,000us-gaap_FederalHomeLoanBankAdvancesLongTerm
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
655,000,000us-gaap_FederalHomeLoanBankAdvancesLongTerm
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Subordinated debentures 35,000,000us-gaap_SubordinatedDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
35,000,000us-gaap_SubordinatedDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Estimate of Fair Value Measurement [Member]    
Financial Assets    
Investments held-to-maturity and other equity securities 258,986,000sasr_OtherHeldToMaturitySecuritiesAndOtherEquitySecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
263,697,000sasr_OtherHeldToMaturitySecuritiesAndOtherEquitySecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Loans, net of allowance 3,155,845,000us-gaap_LoansReceivableNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
3,118,635,000us-gaap_LoansReceivableNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Other assets 89,011,000us-gaap_InterestReceivableAndOtherAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
88,657,000us-gaap_InterestReceivableAndOtherAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Financial Liabilities    
Time Deposits 451,591,000us-gaap_TimeDeposits
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
444,729,000us-gaap_TimeDeposits
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Securities sold under retail repurchase agreements and federal funds purchased 101,640,000us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
74,432,000us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Advances from FHLB 616,141,000us-gaap_FederalHomeLoanBankAdvancesLongTerm
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
679,163,000us-gaap_FederalHomeLoanBankAdvancesLongTerm
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Subordinated debentures 13,721,000us-gaap_SubordinatedDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
13,276,000us-gaap_SubordinatedDebt
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial Assets    
Investments held-to-maturity and other equity securities 0sasr_OtherHeldToMaturitySecuritiesAndOtherEquitySecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0sasr_OtherHeldToMaturitySecuritiesAndOtherEquitySecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Loans, net of allowance 0us-gaap_LoansReceivableNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0us-gaap_LoansReceivableNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Other assets 0us-gaap_InterestReceivableAndOtherAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0us-gaap_InterestReceivableAndOtherAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Financial Liabilities    
Time Deposits 0us-gaap_TimeDeposits
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0us-gaap_TimeDeposits
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Securities sold under retail repurchase agreements and federal funds purchased 0us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Advances from FHLB 0us-gaap_FederalHomeLoanBankAdvancesLongTerm
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0us-gaap_FederalHomeLoanBankAdvancesLongTerm
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Subordinated debentures 0us-gaap_SubordinatedDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
0us-gaap_SubordinatedDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Significant Other Observable Inputs (Level 2)    
Financial Assets    
Investments held-to-maturity and other equity securities 258,986,000sasr_OtherHeldToMaturitySecuritiesAndOtherEquitySecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
263,697,000sasr_OtherHeldToMaturitySecuritiesAndOtherEquitySecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Loans, net of allowance 0us-gaap_LoansReceivableNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_LoansReceivableNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Other assets 89,011,000us-gaap_InterestReceivableAndOtherAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
88,657,000us-gaap_InterestReceivableAndOtherAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Financial Liabilities    
Time Deposits 451,591,000us-gaap_TimeDeposits
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
444,729,000us-gaap_TimeDeposits
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Securities sold under retail repurchase agreements and federal funds purchased 101,640,000us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
74,432,000us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Advances from FHLB 616,141,000us-gaap_FederalHomeLoanBankAdvancesLongTerm
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
679,163,000us-gaap_FederalHomeLoanBankAdvancesLongTerm
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Subordinated debentures 0us-gaap_SubordinatedDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_SubordinatedDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Significant Unobservable Inputs (Level 3)    
Financial Assets    
Investments held-to-maturity and other equity securities 0sasr_OtherHeldToMaturitySecuritiesAndOtherEquitySecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0sasr_OtherHeldToMaturitySecuritiesAndOtherEquitySecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Loans, net of allowance 3,155,845,000us-gaap_LoansReceivableNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
3,118,635,000us-gaap_LoansReceivableNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Other assets 0us-gaap_InterestReceivableAndOtherAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_InterestReceivableAndOtherAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Financial Liabilities    
Time Deposits 0us-gaap_TimeDeposits
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_TimeDeposits
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Securities sold under retail repurchase agreements and federal funds purchased 0us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_FederalFundsPurchasedAndSecuritiesSoldUnderAgreementsToRepurchase
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Advances from FHLB 0us-gaap_FederalHomeLoanBankAdvancesLongTerm
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_FederalHomeLoanBankAdvancesLongTerm
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Subordinated debentures $ 13,721,000us-gaap_SubordinatedDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
$ 13,276,000us-gaap_SubordinatedDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member