Credit Quality Assessment (Additional Information) (Detail) (USD $)	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Restructured accruing	$ 600,000	$ 1,600,000
Other real estate owned	3,227,000us-gaap_ForeclosedAssets	3,195,000us-gaap_ForeclosedAssets
Restructured Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Specific allowance	200,000	100,000
Additional Financing Receivable Troubled Debt Restructurings Restructured	$ 100,000	$ 100,000

Additional financing receivable troubled debt restructurings restructured.

No definition available.

Name:	sasr_AdditionalFinancingReceivableTroubledDebtRestructuringsRestructured
Namespace Prefix:	sasr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of investment related to financing receivables modified by troubled debt restructurings as of the balance sheet date, for which restructured accruing.

+ References

No definition available.

+ Details

Name:	sasr_FinancingReceivablesTroubledDebtsRestructuringRestructuredAccruing
Namespace Prefix:	sasr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of specific allowance related to troubled debt restructuring.

+ References

No definition available.

+ Details

Name:	sasr_TroubledDebtRestructuringSpecificAllowance
Namespace Prefix:	sasr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4437-111522

+ Details

Name:	us-gaap_ForeclosedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	sasr_CategoriesOfLoanAndCommitmentsAxis=sasr_RestructuredLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: