Borrowings - SBA Debentures Interest Expense and Average Outstanding Balance (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Debt Instrument [Line Items]
Amortization of debt issuance costs			$ 862	$ 770
Cash paid for interest expense			$ 8,390	$ 9,134
Effective interest rate	6.45%	5.99%	6.36%	5.89%
Average outstanding balance	$ 255,241	$ 334,842	$ 273,102	$ 335,864
SBA Debentures | Debentures
Debt Instrument [Line Items]
Stated interest expense	0	329	151	677
Amortization of debt issuance costs	0	44	20	90
Total interest and debt financing costs	0	373	171	767
Cash paid for interest expense	$ 0	$ 0	$ 457	$ 725
Effective interest rate	0.00%	3.25%	3.25%	3.22%
Average outstanding balance	$ 0	$ 45,920	$ 10,523	$ 47,550