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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
	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.

X

- 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

X

- 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

X

- Details

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