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Summary of Assets and Liabilities Measured at Fair Market Value on a Non-Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreclosed assets | $ 10,834 | $ 19,754
Fair Value, Measurements, Nonrecurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateral Dependent Impaired Loans | 14,032 | 27,449
Foreclosed assets | 10,834 | 19,754
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateral Dependent Impaired Loans | 0 | 0
Foreclosed assets | 0 | 0
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateral Dependent Impaired Loans | 14,032 | 27,449
Foreclosed assets | 10,834 | 19,754
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateral Dependent Impaired Loans | 0 | 0
Foreclosed assets | $ 0 | $ 0

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- Definition Collateral dependent impaired loans + References No definition available. + Details
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Namespace Prefix: | bsrr_
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Balance Type: | debit
Period Type: | instant

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- Details
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Data Type: | xbrli:stringItemType
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- Definition Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4437-111522 + Details
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Balance Type: | debit
Period Type: | instant