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Financial Instruments with Off-Balance-Sheet Risk (Narrative) (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014
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Financial Instruments with Off-Balance-Sheet Risk [Abstract] |
Letter of credit | $ 88

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- Details
Name: | bsrr_FinancialInstrumentsWithOffBalanceSheetRiskAbstract
Namespace Prefix: | bsrr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant