XML 37 R28.htm IDEA: XBRL DOCUMENT
v3.22.2

Fair Value Measurement - Additional Information (Detail) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021
Mortgage Backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Average contractual maturity period | 24 years | 23 years

X
- Definition Debt securities available for sale, average contractual maturity period. + References No definition available. + Details
Name: | bbsi_DebtSecuritiesAvailableForSaleAverageContractualMaturityPeriod
Namespace Prefix: | bbsi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_MortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |