Fair Value of Investments - Schedule of Fair Value of Financial Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Total Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	$ 423,040	$ 323,436	$ 418,300	$ 324,296
Purchase of investments	12,951	68,054	28,155	117,311
Proceeds from principal repayments and sales of investments	(11,620)	(2,768)	(22,746)	(53,561)
Accretion of discount/amortization of premium	479	278	732	1,669
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair value, end of period	425,403	388,788	425,403	388,788
Net change in unrealized appreciation (depreciation) related to financial instruments still held	(28)	394	165	839
Total Investments \| Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net gains (losses) included in earnings	14	4	28	104
Total Investments \| Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net gains (losses) included in earnings	539	(216)	934	(1,031)
First Lien Debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	416,964	317,236	412,100	318,189
Purchase of investments	12,852	68,054	28,056	117,311
Proceeds from principal repayments and sales of investments	(11,620)	(2,768)	(22,746)	(53,561)
Accretion of discount/amortization of premium	473	273	721	1,659
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair value, end of period	419,321	382,588	419,321	382,588
Net change in unrealized appreciation (depreciation) related to financial instruments still held	71	399	394	755
First Lien Debt \| Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net gains (losses) included in earnings	14	4	28	104
First Lien Debt \| Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net gains (losses) included in earnings	638	(211)	1,162	(1,114)
Second Lien Debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value, beginning of period	6,076	6,200	6,200	6,107
Purchase of investments	99	0	99	0
Proceeds from principal repayments and sales of investments	0	0	0	0
Accretion of discount/amortization of premium	6	5	11	10
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Fair value, end of period	6,082	6,200	6,082	6,200
Net change in unrealized appreciation (depreciation) related to financial instruments still held	(99)	(5)	(228)	83
Second Lien Debt \| Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net gains (losses) included in earnings	0	0	0	0
Second Lien Debt \| Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net gains (losses) included in earnings	$ (99)	$ (5)	$ (228)	$ 83

OHA Senior Private Lending Fund (U) LLC 10-Q