Investments - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Debt Securities, Available-for-Sale, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period	$ 881	$ 503	$ 513	$ 597
Provision and recoveries	417	158	1,086	401
Sales/collections and write-offs	(64)	(231)	(365)	(568)
Allowance for credit losses, end of period	1,234	430	1,234	430
Debt Securities, Held-to-Maturity, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period	2,167	2,167	2,167	0
Provision and recoveries	0	0	0	2,167
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	13,038	11,438	12,198	11,081
Provision and recoveries	218	474	1,058	831
Sales/collections and write-offs	(25)	0	(25)	0
Allowance for credit losses, end of period	13,231	11,912	13,231	11,912
Agent loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period	1,476	957	1,312	957
Provision and recoveries	111	354	275	354
Sales/collections and write-offs	0	0	0	0
Allowance for credit losses, end of period	$ 1,587	$ 1,311	$ 1,587	$ 1,311