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Current Accounting Developments - Additional Information (Detail) | Jun. 30, 2012
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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%

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- 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

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