Investments - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period	$ 902	$ 513
Provision and recoveries	275	365
Sales/collections and write-offs	(148)	(52)
Allowance for credit losses, end of period	1,029	826
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period	2,167	2,167
Provision and recoveries	0	0
Sales/collections and write-offs	0	0
Allowance for credit losses, end of period	2,167	2,167
Other loans receivable
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period	15,101	12,198
Provision and recoveries	256	394
Sales/collections and write-offs	0	0
Allowance for credit losses, end of period	15,357	12,592
Agent loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period	1,680	1,312
Provision and recoveries	199	164
Sales/collections and write-offs	0	0
Allowance for credit losses, end of period	$ 1,879	$ 1,476