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Investment Securities - Investments with Unrealized Loss Positions for total investment securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jun. 30, 2019
Investment Securities    
Unrealized Holding Losses Less Than 12 Months, Fair Value $ 6,407 $ 6,796
Unrealized Holding Losses Less Than 12 Months, Unrealized Losses 64 9
Unrealized Holding Losses 12 Months or More, Fair Value 2,313 4,540
Unrealized Holding Losses 12 Months or More, Unrealized Losses 13 12
Unrealized Holding Losses Total, Fair Value 8,720 11,336
Unrealized Holding Losses Total, Unrealized Losses $ 77 $ 21