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Current Accounting Developments - Additional Information (Detail)	Jun. 30, 2012
New Accounting Pronouncement, Early Adoption [Line Items]
Percentage of more-likely-than-not threshold likelihood of fair value is less than its carrying amount	50.00%

X

- Definition

Percentage of Minimum Likelihood of Fair Value Less Than Carrying Value

+ References

No definition available.

+ Details

Name:	bsrr_PercentageOfMinimumLikelihoodOfFairValueLessThanCarryingValue
Namespace Prefix:	bsrr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_NewAccountingPronouncementEarlyAdoptionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration