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Financial Instruments with Off-Balance-Sheet Risk (Schedule of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Commitments to extend credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Financial instruments off-balance sheet credit risks $ 335,232us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember		 $ 366,909us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
Standby letters of credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Financial instruments off-balance sheet credit risks 9,515us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset
/ us-gaap_FinancialInstrumentAxis
= us-gaap_StandbyLettersOfCreditMember		 6,787us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset
/ us-gaap_FinancialInstrumentAxis
= us-gaap_StandbyLettersOfCreditMember
Commercial letters of credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Financial instruments off-balance sheet credit risks $ 7,602us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset
/ us-gaap_FinancialInstrumentAxis
= bsrr_CommercialLettersOfCreditMember		 $ 7,602us-gaap_FairValueDisclosureOffbalanceSheetRisksAmountAsset
/ us-gaap_FinancialInstrumentAxis
= bsrr_CommercialLettersOfCreditMember