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Life Insurance Liabilities (Sensitive Life Insurance Type Products) (Details) - USD ($) | 3 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |
Interest expense | $ 67,218,000 | $ 60,598,000
Life Insurance Segment [Member] | Oxford |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |
Gross premiums | 12,538,000 | 13,414,000
Interest expense | $ 3,786,000 | $ 3,960,000
Expected future lifetime (persistency) of policies in force (years) | 6 years 9 months 18 days | 8 years 2 months 12 days
Weighted average original interest rate of the liability for future policy benefits | 4.98% | 5.23%
Weighted average current interest rate of the liability for future policy benefits | 4.97% | 4.87%
Life Insurance Segment [Member] | Oxford | Expected gross premiums: |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |
Undiscounted balance | $ 358,097,000 | $ 395,641,000
Discounted balance at original discount rate | 278,118,000 | 305,166,000
Discounted balance at current discount rate | 274,345,000 | 307,763,000
Life Insurance Segment [Member] | Oxford | Expected policy benefits: |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |
Undiscounted balance | 732,006,000 | 770,210,000
Discounted balance at original discount rate | 507,787,000 | 528,663,000
Discounted balance at current discount rate | $ 503,456,000 | $ 539,449,000
Life Insurance Segment [Member] | Oxford | Lapses actual experience |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |
Market Risk Benefit Measurement Input | 0.0549 | 0.0529
Life Insurance Segment [Member] | Oxford | Mortality expected experience |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |
Market Risk Benefit Measurement Input | 0.0535 | 0.0493
Life Insurance Segment [Member] | Oxford | Lapses actual experience |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |
Market Risk Benefit Measurement Input | 0.0192 | 0.0171
Life Insurance Segment [Member] | Oxford | Lapses expected experience |  |
Liability for Future Policy Benefit, after Reinsurance [Abstract] |  |
Market Risk Benefit Measurement Input | 0.0273 | 0.0264

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