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INVESTMENTS - Schedule of Fee Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Recurring Fee Income: |  |
Amortization of loan origination fees | $ 1,685 | $ 1,672
Management, valuation and other fees | 445 | 593
Total Recurring Fee Income | 2,130 | 2,265
Non-Recurring Fee Income: |  |
Prepayment fees | 1 | 0
Acceleration of unamortized loan origination fees | 734 | 345
Advisory, loan amendment and other fees | 609 | 690
Total Non-Recurring Fee Income | 1,344 | 1,035
Total Fee Income | $ 3,474 | $ 3,300

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- Definition Acceleration of Unamortized Loan Origination Fees + References No definition available. + Details
Name: | bbdc_AccelerationOfUnamortizedLoanOriginationFees
Namespace Prefix: | bbdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Advisory, Loan Amendment and Other Fees + References No definition available. + Details
Name: | bbdc_AdvisoryLoanAmendmentAndOtherFees
Namespace Prefix: | bbdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amortization Of Loan Origination Fees + References No definition available. + Details
Name: | bbdc_AmortizationOfLoanOriginationFees
Namespace Prefix: | bbdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Fee And Other Income + References No definition available. + Details
Name: | bbdc_FeeAndOtherIncome
Namespace Prefix: | bbdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Investment Company, Recurring Fee Income + References No definition available. + Details
Name: | bbdc_InvestmentCompanyRecurringFeeIncome
Namespace Prefix: | bbdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Management, Valuation and Other Fees + References No definition available. + Details
Name: | bbdc_ManagementValuationAndOtherFees
Namespace Prefix: | bbdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Non-Recurring Fee Income + References No definition available. + Details
Name: | bbdc_NonRecurringFeeIncomeAbstract
Namespace Prefix: | bbdc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Non-Recurring Fee Income Net + References No definition available. + Details
Name: | bbdc_NonRecurringFeeIncomeNet
Namespace Prefix: | bbdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Recurring Fee Income + References No definition available. + Details
Name: | bbdc_RecurringFeeIncomeAbstract
Namespace Prefix: | bbdc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of income earned, after hedging basis adjustments, from fees charged for prepayment of certain Federal Home Loan Bank (FHLBank) advances before original maturity. + References No definition available. + Details
Name: | us-gaap_PrepaymentFeesOnAdvancesNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration