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Life Insurance Liability - (Balance Changes Liabilities Investment Contracts) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Policyholder Account Balance [Roll Forward] |  |
Policyholder contract deposits account balance Beginning of year | $ 8,232 |
End of period | 18,070 | $ 8,232
Deferred Fixed Annuity Member |  |
Policyholder Account Balance [Roll Forward] |  |
Policyholder contract deposits account balance Beginning of year | 2,398,884 | 2,336,238
Deposits received | 360,124 | 326,465
Surrenders and withdrawals | (379,099) | (287,796)
Benefit payments | (39,990) | (33,548)
Interest credited | 71,433 | 57,525
End of period | $ 2,411,352 | $ 2,398,884
Weighted average credited rate | 3.03% | 2.43%
Cash surrender value | $ 2,104,617 | $ 2,067,735

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