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Troubled Debt Restructurings Defaulted During Period (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Financing Receivable, Modifications [Line Items] |  |
Recorded Investment | $ 175 | $ 2,567
Charge-Offs | 98 | 0
Real Estate Loans |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded Investment | 0 | 2,079
Charge-Offs | 0 | 0
Consumer Loans |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded Investment | 2 | 488
Charge-Offs | 2 | 0
Subsequent Default Number Of Loans | 1 | 3
1-4 Family - closed end | Real Estate Loans |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded Investment | 0 | 93
Charge-Offs | 0 | 0
Subsequent Default Number Of Loans | 0 | 1
Equity Lines | Real Estate Loans |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded Investment | 0 | 213
Charge-Offs | 0 | 0
Subsequent Default Number Of Loans | 0 | 1
Commercial real estate - owner occupied | Real Estate Loans |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded Investment | 0 | 1,773
Charge-Offs | 0 | 0
Subsequent Default Number Of Loans | 0 | 2
Agricultural |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded Investment | 0 | 0
Charge-Offs | 0 | 0
Subsequent Default Number Of Loans | 0 | 0
Commercial and Industrial |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded Investment | 173 | 0
Charge-Offs | 96 | 0
Subsequent Default Number Of Loans | 2 | 0
Small Business Loans |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded Investment | 0 | 0
Charge-Offs | $ 0 | $ 0
Subsequent Default Number Of Loans | 0 | 0

X
- Definition Financing Receivable Modifications Charge Offs. + References No definition available. + Details
Name: | bsrr_FinancingReceivableModificationsChargeOffs
Namespace Prefix: | bsrr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the subsequent default number of loans. + References No definition available. + Details
Name: | bsrr_SubsequentDefaultNumberOfLoans
Namespace Prefix: | bsrr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the subsequent default recorded investment. + References No definition available. + Details
Name: | bsrr_SubsequentDefaultRecordedInvestment
Namespace Prefix: | bsrr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration