Investment Securities - Investments with Unrealized Loss Positions for total investment securities (Details) - USD ($)	Sep. 30, 2021	Jun. 30, 2021
Investment Securities
Unrealized Holding Losses Less Than 12 Months, Fair Value	$ 119,650,000	$ 84,600,000
Unrealized Holding Losses Less Than 12 Months, Unrealized Losses	746,000	810,000
Unrealized Holding Losses 12 Months or More, Fair Value	8,787,000
Unrealized Holding Losses 12 Months or More, Unrealized Losses	355,000
Unrealized Holding Losses Total, Fair Value	128,437,000	84,600,000
Unrealized Holding Losses Total, Unrealized Losses	$ 1,101,000	$ 810,000