Fair Value (Carrying Amounts and Fair Values of Company's Financial Instruments) (Detail) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Financial Assets
Investments held-to-maturity and other equity securities	$ 261,410,000	$ 265,325,000
Loans, net of allowance	3,089,590,000us-gaap_LoansReceivableNet	2,745,500,000us-gaap_LoansReceivableNet
Other assets	88,657,000	86,213,000
Financial Liabilities
Time Deposits	444,922,000us-gaap_TimeDeposits	465,737,000us-gaap_TimeDeposits
Securities sold under retail repurchase agreements and federal funds purchased	74,432,000	53,842,000
Advances from FHLB	655,000,000	615,000,000
Subordinated debentures	35,000,000us-gaap_SubordinatedDebt	35,000,000us-gaap_SubordinatedDebt
Financial Assets
Investments held-to-maturity and other equity securities	263,697,000	256,694,000
Investments held-to-maturity	222,260,000	216,007,000
Loans, net of allowance	3,118,635,000sasr_LoansNetFairValueDisclosure	2,692,877,000sasr_LoansNetFairValueDisclosure
Other assets	88,657,000	86,213,000
Financial Liabilities
Time Deposits	444,729,000us-gaap_DepositsFairValueDisclosure	465,392,000us-gaap_DepositsFairValueDisclosure
Securities sold under retail repurchase agreements and federal funds purchased	74,432,000	53,842,000
Advances from FHLB	679,163,000	641,901,000
Subordinated debentures	13,276,000	11,376,000
Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets
Investments held-to-maturity and other equity securities	0	0
Loans, net of allowance	0	0
Other assets	0	0
Financial Liabilities
Time Deposits	0	0
Securities sold under retail repurchase agreements and federal funds purchased	0	0
Advances from FHLB	0	0
Subordinated debentures	0	0
Significant Other Observable Inputs (Level 2)
Financial Assets
Investments held-to-maturity and other equity securities	263,697,000	256,694,000
Loans, net of allowance	0	0
Other assets	88,657,000	86,213,000
Financial Liabilities
Time Deposits	444,729,000	465,392,000
Securities sold under retail repurchase agreements and federal funds purchased	74,432,000	53,842,000
Advances from FHLB	679,163,000	641,901,000
Subordinated debentures	0	0
Significant Unobservable Inputs (Level 3)
Financial Assets
Investments held-to-maturity and other equity securities	0	0
Loans, net of allowance	3,118,635,000	2,692,877,000
Other assets	0	0
Financial Liabilities
Time Deposits	0	0
Securities sold under retail repurchase agreements and federal funds purchased	0	0
Advances from FHLB	0	0
Subordinated debentures	$ 13,276,000	$ 11,376,000

Federal Home Loan Bank Advances Fair Value

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Fair value of investments in debt securities classified as held-to-maturity and Federal home loan bank stock and federal reserve bank stock fair value.

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No definition available.

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Fair value of interest receivable and other assets as of the reporting date.

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Loans, Net, Fair Value Disclosure

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For an unclassified balance sheet, this item represents investments in other debt securities which are categorized as held-to-maturity; such investments are measured at amortized cost (carrying value). The held-to-maturity category is for those securities that the Entity has the positive intent and ability to hold until maturity. Also includes the amount of Federal Home Loan Bank (FHLB) and Federal Reserve Bank stock.

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Subordinated Debt Fair Value Disclosure

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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Fair value portion of short term borrowing where a bank borrows, at the federal funds rate, from another bank and securities that an entity sells and agrees to repurchase at a specified date for a specified price.

+ References

No definition available.

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Amount after offset of short term borrowing where a bank borrows, at the federal funds rate, from another bank and securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 45

-Paragraph 1

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-SubTopic 210

-Section S99

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-Subparagraph (SX 210.9-03.16)

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-Section 03

-Paragraph 16

-Article 9

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-Topic 942

-SubTopic 470

-Section 50

-Paragraph 2

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Fair value of investments in debt securities classified as held-to-maturity.

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-Topic 320

-SubTopic 10

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-Paragraph 5

-Subparagraph (aa)

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Carrying amount of interest earned but not received (also called accrued interest or accrued interest receivable) and carrying amounts of assets not separately disclosed.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.

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-Section 03

-Paragraph 7

-Subparagraph a

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-Name Accounting Standards Codification

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-Paragraph 1

-Subparagraph (SX 210.9-03.7(a))

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Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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-Publisher FASB

-Name Accounting Standards Codification

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-Topic 944

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-Name Staff Accounting Bulletin (SAB)

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-Section F

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Article 5

-Subsection 19, 20, 22

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- Definition

Amount of deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

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