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AGREEMENTS AND RELATED PARTY TRANSACTIONS (Details)					3 Months Ended
	Aug. 02, 2022 qtr	Feb. 25, 2022 USD ($)	Dec. 23, 2020 USD ($)	Aug. 02, 2018	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2022 USD ($)
Related Party Transaction [Line Items]
Management fee expense					$ 7,853,000	$ 5,872,000
Base management fees payable					7,853,000		$ 7,981,000
Incentive fee expense					9,604,000	4,754,000
Incentive management fees payable					9,604,000		0
Administrative fees payable					700,000	1,000,000
Administrative fees payable					$ 670,000		$ 677,000
Look-back period provision | qtr	12
Original Advisory Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Base management fee, percent	1.375%
Incentive fee, percent				2.00%
Amended and Restated Advisory Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Base management fee, percent			1.25%
New Barings BDC Advisory Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent		2.0625%
Original Advisory Agreement - Annualized Incentive Fee Rate | Affiliated Entity
Related Party Transaction [Line Items]
Base management fee				8.00%
New Barings BDC Advisory Agreement - Annualized Incentive Fee Rate | Affiliated Entity
Related Party Transaction [Line Items]
Base management fee		8.25%
Investment Advisory Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Base management fee					1.25%
Investment Management Agreement - Incentive Rate, Quarterly Hurdle Rate | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent				2.0625%
Investment Management Agreement - Incentive Rate, Annualized Hurdle Rate | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent				8.25%
Investment Management Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income Below Catch-Up Threshold | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent				100.00%
Investment Management Agreement - Incentive Rate, Quarterly Catch-Up Threshold | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent				2.57813%
Investment Management Agreement - Incentive Rate, Annual Catch-Up Threshold | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent				10.3125%
Investment Management Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income Exceeds Catch-Up Threshold | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent				20.00%
Pre-Incentive Fee Net Investment Income For Trailing Twelve Quarters Exceeds Catch-Up Amount | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent				20.00%
Investment Management Agreement - Incentive Rate, Cumulative Pre-Incentive Fee Net Return | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent				20.00%
Investment Management Agreement - Incentive Rate, Realized Capital Gains
Related Party Transaction [Line Items]
Incentive fee expense					$ 0	0
Investment Management Agreement - Incentive Rate, Realized Capital Gains | Affiliated Entity
Related Party Transaction [Line Items]
Incentive fee, percent				20.00%
Investment Management Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income
Related Party Transaction [Line Items]
Incentive fee expense					$ 9,600,000	$ 4,800,000
MVC Credit Support Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction amount (up to)			$ 23,000,000
Related party transaction, term			10 years
Sierra Credit Support Agreement | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction amount (up to)		$ 100,000,000
Related party transaction, term		10 years
MVC Credit Support Agreement - Covered Credit Losses Minimum | Affiliated Entity
Related Party Transaction [Line Items]
Related party transaction amount (up to)			$ 0.00

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