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v3.20.1

Revenue Recognition - General Information (Details) | 3 Months Ended
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Mar. 31, 2020
Revenue from Contract with Customer [Abstract] |
Percentage of revenue outside of scope of ASC 606 (as a percent) | 21.00%

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- Definition Noninterest Revenue Outside Scope of Accounting Standard Codification 606, Percentage + References No definition available. + Details
Name: | bsrr_NoninterestRevenueOutsideScopeOfAccountingStandardCodification606Percentage
Namespace Prefix: | bsrr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration