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