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Investment Securities - Total investment securities for amortized cost and estimated fair value (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Jun. 30, 2019
Investment Securities    
Amortized Cost $ 74,228 $ 99,847
Gross Unrealized Gains 2,120 1,502
Gross Unrealized (Losses) (121) (21)
Estimated Fair Value 76,227 101,328
Carrying Value $ 74,310 $ 100,059