Borrowings - SBA Debentures Interest Expense and Average Outstanding Balance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Amortization of debt issuance costs	$ 1,571	$ 1,505	$ 1,528
Cash paid for interest expense	$ 15,865	$ 15,660	$ 18,189
Effective interest rate	6.56%	6.38%	6.01%
Average outstanding balance	$ 251,696	$ 260,792	$ 324,357
SBA Debentures | Debentures
Debt Instrument [Line Items]
Stated interest expense	0	151	1,236
Amortization of debt issuance costs	0	20	162
Total interest and debt financing costs	0	171	1,398
Cash paid for interest expense	$ 0	$ 457	$ 1,418
Effective interest rate	0.00%	3.26%	3.25%
Average outstanding balance	$ 0	$ 5,233	$ 43,046