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Investment Securities-Schedule of Realized Gain (Loss) (Details) - USD ($)
6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]    
Proceeds from Sale of Debt Securities, Available-for-sale $ 0 $ 30,190,000
Debt Securities, Available-for-sale, Realized Gain   $ 862,000