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Allowance for Loan and Lease Losses - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified |  |  | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011 | Jun. 30, 2012 Minimum | Jun. 30, 2012 Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Troubled debt restructuring reserves amount | $ 4,669 | $ 3,635 |  |
Appraisal receiving period |  |  | 30 days | 60 days
Percentage collateral to impaired loan balances | 76.00% |  |  |
General reserve established for probable incurred losses on unimpaired loans | $ 6,192 | $ 8,529 |  |

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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