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Investments - Narrative (Details) - USD ($)
Jun. 30, 2024
Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]    
Accrued interest $ 4,500,000 $ 3,800,000
Debt securities, gross unrealized losses 1,481,000 3,698,000
Impairment on debt securities 0 0
Debt securities credit losses 0 0
Debt securities, available-for-sale, unrealized loss position $ 486,829,000 $ 547,490,000