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Investment Securities - Total investment securities for amortized cost and estimated fair value (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Jun. 30, 2020
Investment Securities    
Amortized Cost $ 243,183 $ 123,210
Gross Unrealized Gains 2,118 2,777
Gross Unrealized (Losses) (1,989) (69)
Estimated Fair Value 243,312 125,918
Carrying Value $ 243,282 $ 123,344