COMMITMENTS AND CONTINGENCIES - Schedule of Unfunded Commitments to Fund Delayed Draw Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	$ 59,778	$ 38,965
Investment, Identifier [Axis]: 360 Training
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	2,734	0
Investment, Identifier [Axis]: ARMstrong
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	1,007	1,007
Investment, Identifier [Axis]: ASTP Holdings Co-Investment LP
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	26	26
Investment, Identifier [Axis]: Alternative Logistics Technologies Buyer, LLC
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	1,118	0
Investment, Identifier [Axis]: Aramsco
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	520	520
Investment, Identifier [Axis]: Arax Investment Partners
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	236	0
Investment, Identifier [Axis]: Chroma Color
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	381	381
Investment, Identifier [Axis]: ClaimLogiq
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	891	891
Investment, Identifier [Axis]: Contract Land Staff
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	2,674	0
Investment, Identifier [Axis]: CrossCountry Consulting
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	560	560
Investment, Identifier [Axis]: Elevation Labs
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	420	599
Investment, Identifier [Axis]: Engage
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	2,040	2,040
Investment, Identifier [Axis]: Ergotech (INS)
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	1,139	1,139
Investment, Identifier [Axis]: Evergreen Services Group II
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	231	923
Investment, Identifier [Axis]: EyeSouth
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	266	266
Investment, Identifier [Axis]: Health Management Associates
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	415	415
Investment, Identifier [Axis]: Heartland Veterinary Partners
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	5,000	0
Investment, Identifier [Axis]: ITSavvy
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	36	36
Investment, Identifier [Axis]: Image First
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	126	0
Investment, Identifier [Axis]: Impact Environmental Group
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	1,029	1,832
Investment, Identifier [Axis]: Industrial Service Group
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	665	2,019
Investment, Identifier [Axis]: Infobase
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	0	122
Investment, Identifier [Axis]: Kenco
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	850	850
Investment, Identifier [Axis]: LMI Consulting, LLC
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	2	2
Investment, Identifier [Axis]: Legacy Service Partners
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	0	306
Investment, Identifier [Axis]: Leo Facilities
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	2,126	2,571
Investment, Identifier [Axis]: MEI Buyer LLC
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	501	501
Investment, Identifier [Axis]: Market Performance Group
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	908	0
Investment, Identifier [Axis]: Mobile Communications America Inc
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	1,463	1,463
Investment, Identifier [Axis]: Motion & Control Enterprises
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	104	1,704
Investment, Identifier [Axis]: National Power
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	799	799
Investment, Identifier [Axis]: NearU
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	1,919	1,919
Investment, Identifier [Axis]: OMNIA Partners
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	0	129
Investment, Identifier [Axis]: Online Labels Group
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	237	237
Investment, Identifier [Axis]: Ovation Holdings
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	127	127
Investment, Identifier [Axis]: Palmetto Exterminators
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	84	503
Investment, Identifier [Axis]: Pinnacle Supply Partners, LLC
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	1,455	1,455
Investment, Identifier [Axis]: Precision Aviation Group
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	2,480	2,480
Investment, Identifier [Axis]: Propark Mobility
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	665	665
Investment, Identifier [Axis]: Randy's Worldwide Automotive
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	1,172	1,332
Investment, Identifier [Axis]: Rhino Tool House
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	12	306
Investment, Identifier [Axis]: Riveron
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	779	779
Investment, Identifier [Axis]: Specialist Resources Global Inc
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	11,789	0
Investment, Identifier [Axis]: Sugar Foods
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	0	1,173
Investment, Identifier [Axis]: Sunny Sky Products
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	464	464
Investment, Identifier [Axis]: TIDI Products
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	1,201	1,201
Investment, Identifier [Axis]: Tech24
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	893	919
Investment, Identifier [Axis]: Tencate
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	1,361	0
Investment, Identifier [Axis]: USA Water
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	2,684	0
Investment, Identifier [Axis]: Velosio
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	1,135	0
Investment, Identifier [Axis]: Vertex Service Partners
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	1,294	1,777
Investment, Identifier [Axis]: WSB / EST
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	329	1,096
Investment, Identifier [Axis]: Young Innovations
Financial Support for Nonconsolidated Legal Entity [Line Items]
Unfunded commitments to fund delayed draw loans	$ 1,431	$ 1,431