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Reinsurance and Policy Benefits and Losses, Claims and Loss Expenses Payable - (Narratives) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Reinsurance recoverable	$ 34,566	$ 37,864
Repwest [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Reinsurance recoverable	32,400	36,200	$ 41,300
Increase (decrease) in reinsurance recoverable	$ 5,600	$ 20,700	$ 7,300
Property and Casualty Insurance [Member]
Reinsurance Premiums For Insurance Companies By Product Segment [Line Items]
Reinsurance recoverable				$ 32,369	$ 36,188	$ 41,329	$ 47,394

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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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The increase (decrease) during the reporting period in the amount of benefits the ceding insurer expects to recover on insurance policies ceded to other insurance entities as of the balance sheet date for all guaranteed benefit types.

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Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

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