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Additional Valuation Information for Impaired Loan Balances Which are Measured Within Level 3 of Fair Value Hierarchy (Detail) (Real Estate Secured loans, Adjusted Appraised Value, USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2012
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Fair Value Amount | 307 |
Minimum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Selling Costs | 15.00% | [1]
Maximum |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Selling Costs | 25.00% | [1]
Weighted Average |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Selling Costs | 15.14% | [1]
[1] | Represents the range of estimated selling and closing costs that might be incurred through escrow at the time of sale.

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- Definition Fair Value Inputs Selling Costs + References No definition available. + Details
Name: | bsrr_FairValueInputsSellingCosts
Namespace Prefix: | bsrr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_FairValueInputsAssetsQuantitativeInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration