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Allowance for Loan and Lease Losses (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Troubled debt restructuring reserves amount | $ 3,333 | $ 3,321
Percentage collateral to impaired loan balances | 84.00% |
General | $ 5,831 | $ 6,328

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- Definition Impaired Financing Receivable With Specific Reserves. + References No definition available. + Details
Name: | bsrr_ImpairedFinancingReceivableWithSpecificReserves
Namespace Prefix: | bsrr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Loans and Leases Receivable Allowance, General Reserves + References No definition available. + Details
Name: | bsrr_LoansAndLeasesReceivableAllowanceGeneralReserves
Namespace Prefix: | bsrr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage Of Impaired Loans With Appraisal. + References No definition available. + Details
Name: | bsrr_PercentageOfImpairedLoansWithAppraisal
Namespace Prefix: | bsrr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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