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Related Party Transactions (Related Party Assets) (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Mar. 31, 2024
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Related Party Transaction [Line Items] |  |
Related party assets | $ 54,288 | $ 57,934
Blackwater [Member] |  |
Related Party Transaction [Line Items] |  |
Related party assets | 40,135 | 31,950
Mercury [Member] |  |
Related Party Transaction [Line Items] |  |
Related party assets | 22,525 | 24,536
Insurance Group [Member] |  |
Related Party Transaction [Line Items] |  |
Related party assets | $ 8,372 | $ 1,448

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