Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after reinsurance, of paid claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of incurred-but-not-reported (IBNR) liabilities plus expected development on reported claims, for claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of incurred claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts for accident years not separately presented in claim development information. Excludes unallocated claim adjustment expense.

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Cumulative number of reported claims for short-duration insurance contracts.

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Other Insurance Reserves and Policyholder Funds - Information About Incurred and Paid Claims Development, Medicare Supplement (Details) - Medicare Supplement [Member] $ in Thousands	Dec. 31, 2025 USD ($) Claim	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Other Insurance Reserves and Policyholder Funds [Abstract]
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance	$ 621,871
All outstanding liabilities prior period net of reinsurance	609,287
Liabilities for losses, claims and loss adjustment expenses, net of reinsurance	12,584
Accident Year 2016 [Member]
Other Insurance Reserves and Policyholder Funds [Abstract]
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance	63,221	$ 63,221	$ 63,221	$ 63,221	$ 63,221	$ 63,221	$ 63,225	$ 63,226	$ 59,851	$ 58,849
IBNR Reserves	$ 0
Cumulative number of reported claims (in Claim) \| Claim	1,879
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance	$ 63,221	63,221	63,221	63,221	63,221	63,221	63,225	63,226	59,747	$ 49,165
Accident Year 2017 [Member]
Other Insurance Reserves and Policyholder Funds [Abstract]
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance	69,633	69,633	69,632	69,633	69,633	69,635	69,643	69,655	67,960
IBNR Reserves	$ 0
Cumulative number of reported claims (in Claim) \| Claim	2,929
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance	$ 69,633	69,633	69,633	69,633	69,633	69,635	69,643	69,517	$ 57,696
Accident Year 2018 [Member]
Other Insurance Reserves and Policyholder Funds [Abstract]
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance	80,348	80,348	80,348	80,351	80,357	80,361	80,404	79,140
IBNR Reserves	$ 0
Cumulative number of reported claims (in Claim) \| Claim	4,106
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance	$ 80,348	80,348	80,348	80,351	80,355	80,361	80,222	$ 66,565
Accident Year 2019 [Member]
Other Insurance Reserves and Policyholder Funds [Abstract]
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance	86,978	86,978	86,980	86,986	86,988	87,028	88,765
IBNR Reserves	$ 0
Cumulative number of reported claims (in Claim) \| Claim	4,494
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance	$ 86,978	86,978	86,980	86,985	86,978	86,856	$ 72,333
Accident Year 2020 [Member]
Other Insurance Reserves and Policyholder Funds [Abstract]
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance	75,709	75,708	75,730	75,730	75,715	75,857
IBNR Reserves	$ 0
Cumulative number of reported claims (in Claim) \| Claim	3,706
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance	$ 75,709	75,708	75,715	75,710	75,527	$ 63,129
Accident Year 2021 [Member]
Other Insurance Reserves and Policyholder Funds [Abstract]
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance	61,727	61,740	61,785	61,579	65,267
IBNR Reserves	$ 0
Cumulative number of reported claims (in Claim) \| Claim	3,543
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance	$ 61,727	61,726	61,733	61,350	$ 50,197
Accident Year 2022 [Member]
Other Insurance Reserves and Policyholder Funds [Abstract]
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance	55,911	55,970	56,047	58,777
IBNR Reserves	$ 11
Cumulative number of reported claims (in Claim) \| Claim	4,214
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance	$ 55,900	55,920	55,808	$ 46,111
Accident Year 2023 [Member]
Other Insurance Reserves and Policyholder Funds [Abstract]
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance	47,098	47,029	48,367
IBNR Reserves	$ 66
Cumulative number of reported claims (in Claim) \| Claim	4,320
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance	$ 47,032	46,795	$ 36,388
Accident Year 2024 [Member]
Other Insurance Reserves and Policyholder Funds [Abstract]
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance	39,863	43,708
IBNR Reserves	$ 474
Cumulative number of reported claims (in Claim) \| Claim	3,797
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance	$ 39,389	$ 31,500
Accident Year 2025 [Member]
Other Insurance Reserves and Policyholder Funds [Abstract]
Incurred losses, claims and allocated loss adjustment expenses, net of reinsurance	41,383
IBNR Reserves	$ 12,033
Cumulative number of reported claims (in Claim) \| Claim	2,014
Cumulative paid losses, claims and allocated loss adjustment expense, net of reinsurance	$ 29,350