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Allowance for Loan and Lease Losses - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Minimum	Mar. 31, 2013 Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructuring reserves amount	$ 2,719	$ 3,224
Appraisal receiving period			30 days	60 days
Percentage collateral to impaired loan balances	80.00%
General	$ 6,984	$ 6,748

X

- Definition

Financing Receivable Appraisal Receiving Period.

+ References

No definition available.

+ Details

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

X

- Definition

Impaired Financing Receivable With Specific Reserves

+ References

No definition available.

+ Details

Name:	bsrr_ImpairedFinancingReceivableWithSpecificReserves
Namespace Prefix:	bsrr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Loans and Leases Receivable Allowance, General Reserves

+ References

No definition available.

+ Details

Name:	bsrr_LoansAndLeasesReceivableAllowanceGeneralReserves
Namespace Prefix:	bsrr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Percentage Of Impaired Loans With Appraisal.

+ References

No definition available.

+ Details

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

X

- Details

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