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INVESTMENTS - Schedule of Fee Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Recurring Fee and Other Income: |  |  |  |
Amortization of loan origination fees | $ 1,909 | $ 1,763 | $ 3,673 | $ 3,449
Management, valuation and other fees | 660 | 396 | 1,226 | 840
Royalty income | 148 | 75 | 303 | 75
Total Recurring Fee and Other Income | 2,717 | 2,234 | 5,202 | 4,364
Non-Recurring Fee and Other Income: |  |  |  |
Prepayment fees | 55 | 271 | 196 | 272
Acceleration of unamortized loan origination fees | 656 | 1,290 | 1,540 | 2,024
Advisory, loan amendment and other fees | 1,452 | (26) | 1,516 | 582
Total Non-Recurring Fee and Other Income | 2,163 | 1,535 | 3,252 | 2,878
Total Fee and Other Income | $ 4,880 | $ 3,769 | $ 8,454 | $ 7,242

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

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- Definition Non-Recurring Fee Income + References No definition available. + Details
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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
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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

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- 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

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- 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