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INVESTMENTS - Schedule of Fee Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Recurring Fee and Other Income: |  |
Amortization of loan origination fees | $ 1,764 | $ 1,685
Management, valuation and other fees | 566 | 445
Royalty income | 155 | 0
Total Recurring Fee and Other Income | 2,485 | 2,130
Non-Recurring Fee and Other Income: |  |
Prepayment fees | 140 | 1
Acceleration of unamortized loan origination fees | 884 | 734
Advisory, loan amendment and other fees | 64 | 609
Total Non-Recurring Fee and Other Income | 1,088 | 1,344
Total Fee and Other Income | $ 3,573 | $ 3,474

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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 Income (Expense) + References No definition available. + Details
Name: | bbdc_AdvisoryLoanAmendmentAndOtherFeesIncomeExpense
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

X
- 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 Royalty Income, Operating + References No definition available. + Details
Name: | bbdc_RoyaltyIncomeOperating
Namespace Prefix: | bbdc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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