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Fair Value Disclosures and Reporting, the Fair Value Option and Fair Value Measurements (Schedule of Off-Balance-Sheet Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Commitments to extend credit [Member]    
Off-balance-sheet financial instruments:    
Notional Amount $ 335,232invest_DerivativeNotionalAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember		 $ 366,909invest_DerivativeNotionalAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommitmentsToExtendCreditMember
Standby letters of credit [Member]    
Off-balance-sheet financial instruments:    
Notional Amount 9,515invest_DerivativeNotionalAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_StandbyLettersOfCreditMember		 6,787invest_DerivativeNotionalAmount
/ us-gaap_FinancialInstrumentAxis
= us-gaap_StandbyLettersOfCreditMember
Commercial and similar letters of credit [Member]    
Off-balance-sheet financial instruments:    
Notional Amount $ 7,602invest_DerivativeNotionalAmount
/ us-gaap_FinancialInstrumentAxis
= bsrr_CommercialLettersOfCreditMember		 $ 7,602invest_DerivativeNotionalAmount
/ us-gaap_FinancialInstrumentAxis
= bsrr_CommercialLettersOfCreditMember