Life Insurance Liabilities (Balance Changes Liabilities Investment Contracts) (Details) - Deferred Fixed Annuity [Member] - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Policyholder Account Balance [Roll Forward]
Policyholder contract deposits account balance Beginning of year	$ 2,411,352	$ 2,398,884
Deposits received	76,417	43,944
Surrenders and withdrawals	(94,440)	(64,445)
Benefit payments	(12,745)	(10,813)
Interest credited	19,507	16,760
End of period	$ 2,406,464	$ 2,384,330
Weighted average credited rate	3.27%	2.79%
Cash surrender value	$ 2,084,896	$ 2,069,292