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Financial Instruments with Off-Balance-Sheet Risk (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014
Financial Instruments with Off-Balance-Sheet Risk [Abstract]
Letter of credit	$ 88

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- Details

Name:	bsrr_FinancialInstrumentsWithOffBalanceSheetRiskAbstract
Namespace Prefix:	bsrr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant