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INVESTMENTS - Schedule of Fee Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Recurring Fee and Other Income: |  |  |  |
Amortization of loan origination fees | $ 1,780 | $ 1,743 | $ 5,453 | $ 5,191
Management, valuation and other fees | 656 | 403 | 1,883 | 1,244
Royalty income | 36 | 176 | 339 | 251
Total Recurring Fee and Other Income | 2,472 | 2,322 | 7,675 | 6,686
Non-Recurring Fee and Other Income: |  |  |  |
Prepayment fees | 124 | 44 | 320 | 316
Acceleration of unamortized loan origination fees | 969 | 855 | 2,509 | 2,880
Advisory, loan amendment and other fees | 439 | 1,068 | 1,955 | 1,650
Total Non-Recurring Fee and Other Income | 1,532 | 1,967 | 4,784 | 4,846
Total Fee and Other Income | $ 4,004 | $ 4,289 | $ 12,459 | $ 11,532

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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
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
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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
Period Type: | duration

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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
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
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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