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Revenue Recognition - General Information (Details) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Revenue Recognition |  |  |
Percentage of income outside of scope of ASC 606 (as a percent) | 33.33% | 18.22% | 24.00%

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

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