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Share Based Compensation (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 7,000us-gaap_ShareBasedCompensation $ 12,000us-gaap_ShareBasedCompensation  
1998 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of Shares Outstanding 91,300us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
/ us-gaap_PlanNameAxis
= bsrr_StockOptionPlanMember
   
2007 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized but unissued     1,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= bsrr_StockOptionPlansMember
Number of remaining shares available for grant 802,660us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= bsrr_StockOptionPlansMember
   
Share-based compensation expense $ 7,000us-gaap_ShareBasedCompensation
/ us-gaap_PlanNameAxis
= bsrr_StockOptionPlansMember
$ 12,000us-gaap_ShareBasedCompensation
/ us-gaap_PlanNameAxis
= bsrr_StockOptionPlansMember