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Credit Quality Assessment (Credit Risk Rating Indicators for Each Segment of Commercial Loan Portfolio) (Detail) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases $ 3,164,706,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome $ 3,127,392,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Commercial    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 385,452,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 390,781,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Pass | Commercial    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 360,219,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_PassMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 366,367,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_PassMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Special Mention | Commercial    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 8,212,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SpecialMentionMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 8,835,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SpecialMentionMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Substandard | Commercial    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 17,021,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SubstandardMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 15,579,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SubstandardMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Doubtful | Commercial    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 0us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_DoubtfulMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 0us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_DoubtfulMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Commercial Portfolio Segment [Member]    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 1,876,960,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember		 1,847,159,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Portfolio Segment [Member] | Pass    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 1,806,907,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_PassMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember		 1,771,095,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_PassMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Portfolio Segment [Member] | Special Mention    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 17,198,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SpecialMentionMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember		 21,133,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SpecialMentionMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Portfolio Segment [Member] | Substandard    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 52,855,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SubstandardMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember		 54,931,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SubstandardMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Portfolio Segment [Member] | Doubtful    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 0us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_DoubtfulMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember		 0us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_DoubtfulMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Real Estate Portfolio Segment | Commercial Acquisition, Development and Construction    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 203,731,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_AcquisitionDevelopmentAndConstructionMortgageLoansMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 205,124,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_AcquisitionDevelopmentAndConstructionMortgageLoansMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 668,931,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_InvestorMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 640,193,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_InvestorMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 618,846,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_CommercialMortgageLoansOwnerOccupiedMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 611,061,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_CommercialMortgageLoansOwnerOccupiedMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate Portfolio Segment | Pass | Commercial Acquisition, Development and Construction    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 201,375,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_PassMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_AcquisitionDevelopmentAndConstructionMortgageLoansMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 201,642,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_PassMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_AcquisitionDevelopmentAndConstructionMortgageLoansMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate Portfolio Segment | Pass | Commercial Investor Real Estate    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 654,005,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_PassMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_InvestorMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 621,511,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_PassMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_InvestorMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate Portfolio Segment | Pass | Commercial Owner Occupied Real Estate    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 591,308,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_PassMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_CommercialMortgageLoansOwnerOccupiedMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 581,575,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_PassMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_CommercialMortgageLoansOwnerOccupiedMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate Portfolio Segment | Special Mention | Commercial Acquisition, Development and Construction    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 698,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SpecialMentionMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_AcquisitionDevelopmentAndConstructionMortgageLoansMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 698,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SpecialMentionMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_AcquisitionDevelopmentAndConstructionMortgageLoansMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate Portfolio Segment | Special Mention | Commercial Investor Real Estate    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 1,857,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SpecialMentionMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_InvestorMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 3,931,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SpecialMentionMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_InvestorMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate Portfolio Segment | Special Mention | Commercial Owner Occupied Real Estate    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 6,431,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SpecialMentionMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_CommercialMortgageLoansOwnerOccupiedMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 7,669,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SpecialMentionMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_CommercialMortgageLoansOwnerOccupiedMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate Portfolio Segment | Substandard | Commercial Acquisition, Development and Construction    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 1,658,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SubstandardMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_AcquisitionDevelopmentAndConstructionMortgageLoansMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 2,784,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SubstandardMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_AcquisitionDevelopmentAndConstructionMortgageLoansMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate Portfolio Segment | Substandard | Commercial Investor Real Estate    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 13,069,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SubstandardMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_InvestorMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 14,751,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SubstandardMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_InvestorMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate Portfolio Segment | Substandard | Commercial Owner Occupied Real Estate    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 21,107,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SubstandardMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_CommercialMortgageLoansOwnerOccupiedMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 21,817,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SubstandardMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_CommercialMortgageLoansOwnerOccupiedMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate Portfolio Segment | Doubtful | Commercial Acquisition, Development and Construction    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 0us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_DoubtfulMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_AcquisitionDevelopmentAndConstructionMortgageLoansMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 0us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_DoubtfulMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_AcquisitionDevelopmentAndConstructionMortgageLoansMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate Portfolio Segment | Doubtful | Commercial Investor Real Estate    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 0us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_DoubtfulMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_InvestorMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 0us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_DoubtfulMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_InvestorMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember
Commercial Real Estate Portfolio Segment | Doubtful | Commercial Owner Occupied Real Estate    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases $ 0us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_DoubtfulMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_CommercialMortgageLoansOwnerOccupiedMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 $ 0us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_DoubtfulMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_CommercialMortgageLoansOwnerOccupiedMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember