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Aging of Loan Balances by Number of Days Past Due (Parenthetical) (Detail) (USD $) | Dec. 31, 2011
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Financing Receivable, Recorded Investment, Past Due [Line Items] |
Small Business Administration | $ 48,000
Small Business Administration Loans |
Financing Receivable, Recorded Investment, Past Due [Line Items] |
Small Business Administration | $ 48,000

X
- Definition Financing Receivable Recorded Investment Ninety or More Days Past Due And Still Accruing + References No definition available. + Details
Name: | bsrr_FinancingReceivableRecordedInvestmentNinetyOrMoreDaysPastDueAndStillAccruing
Namespace Prefix: | bsrr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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