Borrowings - Schedule of Borrowings (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Dec. 27, 2024	Jan. 24, 2024	Oct. 04, 2023
Debt Instrument [Line Items]
Less Deferred Financing Costs	$ (11,575)	$ (8,547)
Amount per Consolidated Statements of Assets and Liabilities	2,121,799	2,054,738
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Total Aggregate Borrowing Capacity	2,580,000	2,305,000
Total Principal Outstanding	2,133,374	2,063,285
Less Deferred Financing Costs	(11,575)	(8,547)
Amount per Consolidated Statements of Assets and Liabilities	2,121,799	2,054,738
JPM Credit Facility \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Total Aggregate Borrowing Capacity	800,000	800,000	$ 800,000	$ 400,000	$ 400,000
Total Principal Outstanding	640,668	625,669
Less Deferred Financing Costs	(3,339)	(3,403)
Amount per Consolidated Statements of Assets and Liabilities	637,329	622,266
JPM Revolver Facility \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Total Aggregate Borrowing Capacity	780,000	505,000		505,000
Total Principal Outstanding	494,217	439,216
Less Deferred Financing Costs	(3,127)	0
Amount per Consolidated Statements of Assets and Liabilities	491,090	439,216
Wells Fargo Credit Facility \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Total Aggregate Borrowing Capacity	300,000	300,000		$ 300,000
Total Principal Outstanding	300,000	300,000
Less Deferred Financing Costs	0	0
Amount per Consolidated Statements of Assets and Liabilities	300,000	300,000
2026 Notes \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Total Aggregate Borrowing Capacity	300,000	300,000
Total Principal Outstanding	300,000	300,000
Less Deferred Financing Costs	0	0
Amount per Consolidated Statements of Assets and Liabilities	300,000	300,000
2029 Notes \| Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Total Aggregate Borrowing Capacity	400,000	400,000
Total Principal Outstanding	398,489	398,400
Less Deferred Financing Costs	(5,109)	(5,144)
Amount per Consolidated Statements of Assets and Liabilities	$ 393,380	$ 393,256

Franklin BSP Capital Corp 10-Q