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Allowance for Loan and Lease Losses - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified |  |  | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 Minimum | Jun. 30, 2013 Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Troubled debt restructuring reserves amount | $ 4,408 | $ 4,140 |  |
Appraisal receiving period |  |  | 30 days | 60 days
Percentage collateral to impaired loan balances | 92.00% |  |  |
General | $ 5,030 | $ 6,748 |  |

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- Definition Financing Receivable Appraisal Receiving Period. + References No definition available. + Details
Name: | bsrr_FinancingReceivableAppraisalReceivingPeriod
Namespace Prefix: | bsrr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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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