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Aging of Loan Balances by Number of Days Past Due (Parenthetical) (Detail) (USD $)	Dec. 31, 2011
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