v3.26.1
DERIVATIVE INSTRUMENTS - Schedule of Fair Value and Aggregate Unrealized Appreciation (Depreciation) (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
May 29, 2026
Feb. 25, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
Unrealized Appreciation (Depreciation) $ (3,247,000) $ (3,344,000) $ 2,268,000 $ (25,661,000)      
Prior Sierra Credit Support Agreement              
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
Unrealized Appreciation (Depreciation)         $ 16,100,000    
New Sierra Credit Support Agreement              
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
Unrealized Appreciation (Depreciation)     0        
Barings LLC | Prior Sierra Credit Support Agreement              
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
Notional Amount         100,000,000.0 [1],[2],[3]   $ 100,000,000.0
Value         60,500,000    
Unrealized Appreciation (Depreciation) [1],[2],[3]         $ 16,100,000    
Barings LLC | New Sierra Credit Support Agreement              
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
Notional Amount 10,995,000 [4],[5],[6]   10,995,000 [4],[5],[6]     $ 11,000,000.0  
Value $ 1,329,000   1,329,000        
Unrealized Appreciation (Depreciation) [4],[5],[6]     $ 0        
[1] Settlement Date means the earlier of (1) April 1, 2032 or (2) the date on which the entire Prior Sierra Reference Portfolio has been realized or written off.
[2] The Company and Barings entered into the Prior Sierra Credit Support Agreement pursuant to which Barings agreed to provide credit support to the Company in the amount of up to $100.0 million.
[3] The Prior Sierra Credit Support Agreement (as defined in “Note 2. Agreements and Related Party Transactions”) covers all of the investments acquired by the Company from Sierra in connection with the Sierra Merger and any investments received by the Company in connection with the restructuring, amendment, extension or other modification (including the issuance of new securities) of any of the investments acquired by the Company from Sierra in connection with the Sierra Merger (collectively, the “Prior Sierra Reference Portfolio”). Each investment that is included in the Prior Sierra Reference Portfolio is denoted in the above Schedule of Investments with footnote (28).
[4] Settlement Date means the earlier of (1) April 1, 2032 or (2) the date on which the entire New Sierra Reference Portfolio has been realized or written off.
[5] The Company and Barings LLC (“Barings” or the “Adviser”) entered into the New Sierra Credit Support Agreement pursuant to which Barings agreed to provide credit support to the Company in the amount of up to $11.0 million.
[6] The New Sierra Credit Support Agreement (as defined in “Note 2. Agreements and Related Party Transactions”) covers investments in two portfolio companies acquired by Barings BDC, Inc. (the “Company”) from Sierra Income Corporation (“Sierra”) in connection with the Sierra Merger (as defined in “Note 2. Agreements and Related Party Transactions”) and any investments received by the Company in connection with the restructuring, amendment, extension or other modification of such investments (the “New Sierra Reference Portfolio”). Each investment that is included in the New Sierra Reference Portfolio is denoted in the above Schedule of Investments with footnote (28).