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BUSINESS COMBINATION (Summary of Consideration Paid and Amounts of Assets Acquired and Liabilities Assumed) (Details) (USD $)
0 Months Ended
Nov. 14, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Recognized amounts of identifiable assets acquired and liabilities assumed          
Goodwill   $ 6,908,000us-gaap_Goodwill $ 5,544,000us-gaap_Goodwill $ 5,544,000us-gaap_Goodwill $ 5,544,000us-gaap_Goodwill
SCVB [Member]          
Consideration          
Cash 15,338,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= bsrr_SantaClaraValleyBankMember
       
Equity Instruments           
Contingent Consideration           
Fair value of total consideration transferred 15,338,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= bsrr_SantaClaraValleyBankMember
       
Recognized amounts of identifiable assets acquired and liabilities assumed          
Cash and cash equivalents 15,852,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= bsrr_SantaClaraValleyBankMember
       
Securities 44,187,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsMarketableSecurities
/ us-gaap_BusinessAcquisitionAxis
= bsrr_SantaClaraValleyBankMember
       
Federal Home Loan Bank stock 860,000bsrr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsFederalHomeLoanBankStock
/ us-gaap_BusinessAcquisitionAxis
= bsrr_SantaClaraValleyBankMember
       
Loans 61,573,000bsrr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsLoans
/ us-gaap_BusinessAcquisitionAxis
= bsrr_SantaClaraValleyBankMember
       
Premises and equipment 1,188,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= bsrr_SantaClaraValleyBankMember
       
Core deposit intangibles 1,075,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= bsrr_SantaClaraValleyBankMember
       
Other assets 5,719,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= bsrr_SantaClaraValleyBankMember
       
Total assets acquired 130,454,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= bsrr_SantaClaraValleyBankMember
       
Deposits 108,272,000bsrr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits
/ us-gaap_BusinessAcquisitionAxis
= bsrr_SantaClaraValleyBankMember
       
Federal Home Loan Bank advances 8,000,000bsrr_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFederalHomeLoanBankAdvances
/ us-gaap_BusinessAcquisitionAxis
= bsrr_SantaClaraValleyBankMember
       
Other liabilities 208,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= bsrr_SantaClaraValleyBankMember
       
Total liabilities assumed 116,480,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= bsrr_SantaClaraValleyBankMember
       
Total identifiable net assets 13,974,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= bsrr_SantaClaraValleyBankMember
       
Goodwill 1,364,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= bsrr_SantaClaraValleyBankMember
       
Fair value of total consideration transferred $ 15,338,000us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= bsrr_SantaClaraValleyBankMember