Investments - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period	$ 1,029	$ 826	$ 902	$ 513
Provision and recoveries	(1)	304	274	669
Sales/collections and write-offs	(562)	(249)	(710)	(301)
Allowance for credit losses, end of period	466	881	466	881
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period	2,167	2,167	2,167	2,167
Provision and recoveries	0	0	0	0
Sales/collections and write-offs	0	0	0	0
Allowance for credit losses, end of period	2,167	2,167	2,167	2,167
Other loans receivable
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period	15,357	12,592	15,101	12,198
Provision and recoveries	289	446	545	840
Sales/collections and write-offs	0	0	0	0
Allowance for credit losses, end of period	15,646	13,038	15,646	13,038
Agent loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period	1,879	1,476	1,680	1,312
Provision and recoveries	0	0	199	164
Sales/collections and write-offs	0	0	0	0
Allowance for credit losses, end of period	$ 1,879	$ 1,476	$ 1,879	$ 1,476