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Allowance for Loan and Lease Losses - General Information (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Provision for Loan and Lease Losses [Abstract] |  |
Impaired Financing Receivable With Specific Reserves | $ 600 | $ 600
Percentage Of Impaired Loans With Appraisal | 97.00% |
General | $ 10,300 |

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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 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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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118959141&loc=d3e21338-158488 + Details
Name: | us-gaap_AllowanceForLoanAndLeaseLossesRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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