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Credit Quality and Nonperforming Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan, classified as troubled debt restructuring	$ 51.6
Loan, classified as troubled debt restructuring, non-accrual status	$ 31.8
Loans Accruals Due	90 days	90 days

X

- Definition

Financing Receivable Average Investment Nonaccrual Loans

+ References

No definition available.

+ Details

Name:	bsrr_FinancingReceivableAverageInvestmentNonAccrualLoans
Namespace Prefix:	bsrr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Loans Accruals Due.

+ References

No definition available.

+ Details

Name:	bsrr_LoansAccrualsDue
Namespace Prefix:	bsrr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6951948&loc=d3e18845-111554

+ Details

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