Investments - Other investments - Schedule of Other Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Investment Holdings, Other than Securities [Line Items]
Other investments	$ 85,939	$ 73,025
Other
Investment Holdings, Other than Securities [Line Items]
Other investments	2,484	2,824
Insurance | Operating segments
Investment Holdings, Other than Securities [Line Items]
Other investments	78,976	66,163
Mortgage | Operating segments
Investment Holdings, Other than Securities [Line Items]
Other investments	4,479	4,038
Corporate bonds
Investment Holdings, Other than Securities [Line Items]
Other investments	58,035	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	58,035	42,080
Investment owned, at cost	62,037	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	20,786	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	20,786	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	7,118	7,092
Other investments | Other
Investment Holdings, Other than Securities [Line Items]
Other investments	2,484	2,824
Other investments | Insurance | Operating segments
Investment Holdings, Other than Securities [Line Items]
Other investments	155	230
Other investments | Mortgage | Operating segments
Investment Holdings, Other than Securities [Line Items]
Other investments	$ 4,479	$ 4,038