Investment Securities - Securities by contractual maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jun. 30, 2020
Available for sale, Amortized Cost
Due in one year or less	$ 5	$ 2,904
Due after one year through five years	11,999	9,632
Due after five years through ten years	15,371	7,606
Due after ten years	84,590	69,753
Amortized Cost	111,965	89,895
Available for sale, Fair Value
Due in one year or less	5	2,893
Due after one year through five years	12,285	9,611
Due after five years through ten years	15,582	7,602
Due after ten years	85,037	69,892
Fair Value	$ 112,909	$ 89,998