Goodwill and intangible assets - Schedule in Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Intangible assets — definite life
Total	$ 2,326
Asset Management
Intangible assets — definite life
Accumulated amortization	(8,822)	$ (8,381)
Accumulated impairment	0	(22,642)
Gross carrying amount	19,339	41,984
Net carrying amount	10,517	10,961
Asset Management | Investment management contracts
Intangible assets — definite life
Gross carrying amount	11,148	11,544
Accumulated amortization	(8,822)	(8,381)
Accumulated impairment	0	(393)
Total	2,326	2,770
Insurance Solutions
Intangible assets — indefinite life
Intangible assets — indefinite life	2,444	2,444
Intangible assets — definite life
Net carrying amount	2,444	2,444
Profit Sharing Interest | Asset Management
Intangible assets — indefinite life
Gross carrying amount	8,191	11,236
Accumulated impairment	0
Intangible assets — indefinite life	8,191	8,191
Intangible assets — definite life
Accumulated impairment		(3,045)
Investment management contracts | Asset Management
Intangible assets — indefinite life
Gross carrying amount		19,204
Intangible assets — indefinite life		0
Intangible assets — definite life
Accumulated impairment		(19,204)
Licensing Agreements | Insurance Solutions
Intangible assets — indefinite life
Intangible assets — indefinite life	$ 2,444	$ 2,444