XML 64 R54.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Investments - Revenue and General Obligation Bonds by Location (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
States and Political Subdivisions [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost (available-for-sale securities and held-to-maturity securities) | $ 223,224 | $ 372,313
Fair market value (available-for-sale securities and held-to-maturity securities) | 219,810 | 372,371
General Obligation Bonds [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost (available-for-sale securities and held-to-maturity securities) | 197,752 | 324,679
Fair market value (available-for-sale securities and held-to-maturity securities) | 194,620 | 324,643
General Obligation Bonds [Member] | TEXAS |  |
Marketable Securities [Line Items] |  |
Amortized cost (available-for-sale securities and held-to-maturity securities) | 83,196 | 146,215
Fair market value (available-for-sale securities and held-to-maturity securities) | 82,208 | 146,589
General Obligation Bonds [Member] | CALIFORNIA |  |
Marketable Securities [Line Items] |  |
Amortized cost (available-for-sale securities and held-to-maturity securities) | 51,523 | 63,316
Fair market value (available-for-sale securities and held-to-maturity securities) | 49,174 | 61,048
General Obligation Bonds [Member] | Other [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost (available-for-sale securities and held-to-maturity securities) | 63,033 | 115,148
Fair market value (available-for-sale securities and held-to-maturity securities) | 63,238 | 117,006
Revenue Bonds [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost (available-for-sale securities and held-to-maturity securities) | 25,472 | 47,634
Fair market value (available-for-sale securities and held-to-maturity securities) | 25,190 | 47,728
Revenue Bonds [Member] | TEXAS |  |
Marketable Securities [Line Items] |  |
Amortized cost (available-for-sale securities and held-to-maturity securities) | 5,438 | 8,850
Fair market value (available-for-sale securities and held-to-maturity securities) | 5,393 | 8,899
Revenue Bonds [Member] | CALIFORNIA |  |
Marketable Securities [Line Items] |  |
Amortized cost (available-for-sale securities and held-to-maturity securities) | 3,571 | 3,794
Fair market value (available-for-sale securities and held-to-maturity securities) | 3,496 | 3,735
Revenue Bonds [Member] | Other [Member] |  |
Marketable Securities [Line Items] |  |
Amortized cost (available-for-sale securities and held-to-maturity securities) | 16,463 | 34,990
Fair market value (available-for-sale securities and held-to-maturity securities) | $ 16,301 | $ 35,094

X
- Definition Debt Securities, Excluding Accrued Interest, Amortized Cost + References No definition available. + Details
Name: | bsrr_DebtSecuritiesExcludingAccruedInterestAmortizedCost
Namespace Prefix: | bsrr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Debt Securities, Excluding Accrued Interest, Fair Value + References No definition available. + Details
Name: | bsrr_DebtSecuritiesExcludingAccruedInterestFairValue
Namespace Prefix: | bsrr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_MarketableSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=bsrr_GeneralObligationBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_TX
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=stpr_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=bsrr_OtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=bsrr_RevenueBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |