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Borrowings - SBA-guaranteed Debenture, Other Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Amortization of financing costs	$ 6,780	$ 6,837	$ 7,388
SBA-guaranteed debentures
Debt Instrument [Line Items]
Interest expense	8,104	8,104	8,104
Amortization of financing costs	$ 1,002	$ 1,002	$ 1,002
Weighted average interest rate	2.70%	2.70%	2.70%
Effective interest rate	3.00%	3.00%	3.00%
Average debt outstanding	$ 300,000	$ 300,000	$ 300,000	$ 285,852	$ 179,408

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