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Troubled Debt Restructurings Defaulted During Period (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2013
Financing Receivable, Modifications [Line Items] |  |
Recorded Investment | $ 1,217 | $ 1,545
Charge-Offs | 368 | 591
Real Estate Loans |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded Investment | 1,087 | 1,239
Charge-Offs | 304 | 351
Consumer Loans |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded Investment | 65 | 67
Charge-Offs | 64 | 66
Subsequent Default Number Of Loans | 3 | 4
1-4 Family - closed end | Real Estate Loans |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded Investment | 779 | 779
Charge-Offs | 94 | 94
Subsequent Default Number Of Loans | 2 | 2
Equity Lines | Real Estate Loans |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded Investment | 0 | 0
Charge-Offs | 0 | 0
Subsequent Default Number Of Loans | 0 | 0
Commercial real estate - owner occupied | Real Estate Loans |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded Investment | 308 | 308
Charge-Offs | 210 | 210
Subsequent Default Number Of Loans | 1 | 1
Commercial and Industrial |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded Investment | 65 | 239
Charge-Offs | 0 | 174
Subsequent Default Number Of Loans | 2 | 5
Small Business Loans |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded Investment | 0 | 0
Charge-Offs | 0 | 0
Subsequent Default Number Of Loans | 0 | 0
Other construction/Land | Real Estate Loans |  |
Financing Receivable, Modifications [Line Items] |  |
Recorded Investment | 0 | 152
Charge-Offs | $ 0 | $ 47
Subsequent Default Number Of Loans | 0 | 1

X
- Definition Financing Receivable Modifications Charge Offs. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

X
- Definition Represents the subsequent default number of loans. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
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Period Type: | duration

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- Definition Represents the subsequent default recorded investment. + References No definition available. + Details
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Namespace Prefix: | bsrr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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