Investments - Other investments - Schedule of Other Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Investment Holdings, Other than Securities [Line Items]
Other investments	$ 84,570	$ 73,025
Other
Investment Holdings, Other than Securities [Line Items]
Other investments	2,834	2,824
Insurance | Operating segments
Investment Holdings, Other than Securities [Line Items]
Other investments	77,745	66,163
Mortgage | Operating segments
Investment Holdings, Other than Securities [Line Items]
Other investments	3,991	4,038
Corporate bonds
Investment Holdings, Other than Securities [Line Items]
Other investments	50,342	42,080
Corporate bonds | Other
Investment Holdings, Other than Securities [Line Items]
Other investments	0	0
Corporate bonds | Insurance | Operating segments
Investment Holdings, Other than Securities [Line Items]
Other investments	50,342	42,080
Investment owned, at cost	53,397	45,630
Corporate bonds | Mortgage | Operating segments
Investment Holdings, Other than Securities [Line Items]
Other investments	0	0
Debentures
Investment Holdings, Other than Securities [Line Items]
Other investments	22,153	23,853
Debentures | Other
Investment Holdings, Other than Securities [Line Items]
Other investments	0	0
Debentures | Insurance | Operating segments
Investment Holdings, Other than Securities [Line Items]
Other investments	22,153	23,853
Debentures | Mortgage | Operating segments
Investment Holdings, Other than Securities [Line Items]
Other investments	0	0
Other investments
Investment Holdings, Other than Securities [Line Items]
Other investments	12,075	7,092
Other investments | Other
Investment Holdings, Other than Securities [Line Items]
Other investments	2,834	2,824
Other investments | Insurance | Operating segments
Investment Holdings, Other than Securities [Line Items]
Other investments	5,250	230
Other investments | Mortgage | Operating segments
Investment Holdings, Other than Securities [Line Items]
Other investments	$ 3,991	$ 4,038