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SECURITIES AVAILABLE-FOR-SALE (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]      
Proceeds from sale of available-for-sale securities $ 26,700,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities $ 700,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities $ 56,400,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Number of securities with unrealized gross losses 134bsrr_NumberOfSecuritiesWithUnrealizedGrossLosses 197bsrr_NumberOfSecuritiesWithUnrealizedGrossLosses  
Amortized Cost 504,564,000us-gaap_AvailableForSaleSecuritiesAmortizedCost 424,315,000us-gaap_AvailableForSaleSecuritiesAmortizedCost  
Other Contractual Obligations and Short-Term Borrowing Arrangements [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Pledged financial instruments, not separately reported, securities 137,160,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_UnderlyingAssetClassAxis
= bsrr_OtherContractualObligationsAndShortTermBorrowingArrangementsMember
162,393,000us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
/ us-gaap_UnderlyingAssetClassAxis
= bsrr_OtherContractualObligationsAndShortTermBorrowingArrangementsMember
 
Pledged assets separately reported, securities pledged as collateral, at fair value 140,611,000us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue
/ us-gaap_UnderlyingAssetClassAxis
= bsrr_OtherContractualObligationsAndShortTermBorrowingArrangementsMember
164,390,000us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue
/ us-gaap_UnderlyingAssetClassAxis
= bsrr_OtherContractualObligationsAndShortTermBorrowingArrangementsMember
 
U.S. Government agencies [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Proceeds from sale of available-for-sale securities 502,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
   
Number of securities with realized gross gains 59bsrr_NumberOfSecuritiesWithRealizedGrossGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
   
Equity Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Proceeds from sale of available-for-sale securities 238,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bsrr_EquitySecurityMember
   
Number of securities with realized gross gains 1bsrr_NumberOfSecuritiesWithRealizedGrossGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bsrr_EquitySecurityMember
   
Amortized Cost 1,210,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bsrr_EquitySecurityMember
1,336,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= bsrr_EquitySecurityMember
 
Other Securities [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Number of securities with realized gross gains 7bsrr_NumberOfSecuritiesWithRealizedGrossGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember
   
Available-for-sale securities, gross realized gain (loss) 72,000us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_OtherDebtSecuritiesMember
   
States and Political Subdivisions [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost 98,056,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
97,361,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
 
States and Political Subdivisions [Member] | Arizona [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Amortized Cost $ 3,800,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USStatesAndPoliticalSubdivisionsMember
/ bsrr_StateOfIssuanceAxis
= bsrr_ArizonaStateMember