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Financial Instruments with Off-Balance-Sheet Risk - Additional Information (Details) $ in Millions | Mar. 31, 2020 USD ($)
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Financial Instruments with Off Balance Sheet Risk [Abstract] |
Letters of Credit Outstanding, Amount | $ 105

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- Definition Financial instruments with off balance sheet risk. + References No definition available. + 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