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Credit Quality Assessment (Credit Risk Rating Indicators for Each Segment of Commercial Loan Portfolio) (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases $ 3,127,392,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome $ 2,784,266,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Commercial    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 390,781,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 356,651,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Pass | Commercial    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 366,367,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_PassMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 324,941,000us-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 8,835,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SpecialMentionMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 16,166,000us-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 15,579,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SubstandardMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember		 15,274,000us-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		 270,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_DoubtfulMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
Commercial Portfolio Segment    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 1,847,159,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember		 1,662,348,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Portfolio Segment | Pass    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 1,771,095,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_PassMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember		 1,557,315,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_PassMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Portfolio Segment | Special Mention    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 21,133,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SpecialMentionMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember		 34,812,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SpecialMentionMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Portfolio Segment | Substandard    
Financing Receivable Recorded Investment [Line Items]    
Total loans and leases 54,931,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SubstandardMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember		 69,951,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SubstandardMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialPortfolioSegmentMember
Commercial Portfolio Segment | 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		 270,000us-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 205,124,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_AcquisitionDevelopmentAndConstructionMortgageLoansMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 160,696,000us-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 640,193,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_InvestorMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 552,178,000us-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 611,061,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_CommercialMortgageLoansOwnerOccupiedMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 592,823,000us-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 201,642,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_PassMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_AcquisitionDevelopmentAndConstructionMortgageLoansMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 154,869,000us-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 621,511,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_PassMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_InvestorMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 523,901,000us-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 581,575,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_PassMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_CommercialMortgageLoansOwnerOccupiedMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 553,604,000us-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		 0us-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 3,931,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SpecialMentionMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_InvestorMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 2,944,000us-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 7,669,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SpecialMentionMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_CommercialMortgageLoansOwnerOccupiedMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 15,702,000us-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 2,784,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SubstandardMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_AcquisitionDevelopmentAndConstructionMortgageLoansMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 5,827,000us-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 14,751,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SubstandardMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_InvestorMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 25,333,000us-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 21,817,000us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
/ us-gaap_CreditRatingFitchAxis
= us-gaap_SubstandardMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= sasr_CommercialMortgageLoansOwnerOccupiedMember
/ sasr_FinancingReceivablesInformationByPortfolioSegmentsAxis
= us-gaap_CommercialRealEstatePortfolioSegmentMember		 23,517,000us-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