Commission and Fee Income and Underwriting Fee Income - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Total commission and fee revenue	$ 3,329	$ 3,024
Commission and fee expenses	(1,802)	(1,048)
Net commission and fee income	1,527	1,976
SUA commission revenue
Disaggregation of Revenue [Line Items]
Total commission and fee revenue	2,281	1,837
SUA fee income
Disaggregation of Revenue [Line Items]
Total commission and fee revenue	455	1,177
Other
Disaggregation of Revenue [Line Items]
Total commission and fee revenue	$ 593	$ 10

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details