Reinsurance - Ceded and Assumed Reinsurance (Details) - Property and casualty business - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reinsurance [Line Items]
Ceded premiums written	$ 100,541	$ 88,339	$ 74,511
Ceded premiums earned	92,650	84,924	72,023
Losses and loss settlement expenses ceded	51,878	185,653	28,447
Assumed premiums written	130,375	34,371	27,869
Assumed premiums earned	77,283	33,679	25,412
Losses and loss settlement expenses assumed	$ 45,543	$ 29,141	$ 14,813