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Life Insurance Liabilities (Sensitive Life Insurance Type Products) (Details) - USD ($) | 3 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |
Interest expense | $ 82,330,000 | $ 67,218,000
Life Insurance Segment [Member] | Oxford |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |
Gross premiums | 11,967,000 | 12,538,000
Interest expense | $ 3,690,000 | $ 3,786,000
Expected future lifetime (persistency) of policies in force (years) | 6 years 8 months 12 days | 6 years 9 months 18 days
Weighted average original interest rate of the liability for future policy benefits | 4.91% | 4.98%
Weighted average current interest rate of the liability for future policy benefits | 4.53% | 4.97%
Life Insurance Segment [Member] | Oxford | Expected gross premiums: |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |
Undiscounted balance | $ 332,228,000 | $ 358,097,000
Discounted balance at original discount rate | 256,950,000 | 278,118,000
Discounted balance at current discount rate | 256,112,000 | 274,345,000
Life Insurance Segment [Member] | Oxford | Expected policy benefits: |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |
Undiscounted balance | 692,712,000 | 732,006,000
Discounted balance at original discount rate | 481,531,000 | 507,787,000
Discounted balance at current discount rate | $ 480,547,000 | $ 503,456,000
Life Insurance Segment [Member] | Oxford | Lapses actual experience |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |
Market Risk Benefit Measurement Input | 0.0699 | 0.0549
Life Insurance Segment [Member] | Oxford | Mortality expected experience |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |
Market Risk Benefit Measurement Input | 0.058 | 0.0535
Life Insurance Segment [Member] | Oxford | Lapses actual experience |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |
Market Risk Benefit Measurement Input | 0.0217 | 0.0192
Life Insurance Segment [Member] | Oxford | Lapses expected experience |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |
Market Risk Benefit Measurement Input | 0.0314 | 0.0273

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