Goodwill and intangible assets - Goodwill Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Goodwill
Goodwill, Gross	$ 55,697
Accumulated impairment losses	(25,504)	$ (25,500)
Balance, beginning of period	30,193	55,697
Impairment losses	0	(25,504)
Balance, end of period	30,193	30,193
Insurance Solutions
Goodwill
Balance, beginning of period	30,193
Balance, end of period	30,193	30,193
Insurance Solutions | MYGA
Goodwill
Goodwill, Gross	30,193
Accumulated impairment losses	0
Balance, beginning of period	30,193	30,193
Impairment losses		0
Balance, end of period	30,193	30,193
Insurance Solutions | LTC
Goodwill
Goodwill, Gross	25,504
Accumulated impairment losses	(25,504)
Balance, beginning of period	0	25,504
Impairment losses		(25,504)
Balance, end of period	$ 0	$ 0