Investment Securities - Investments with Unrealized Loss Positions for Available for sale (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020
Schedule of Available-for-sale Securities [Line Items]
Unrealized Holding Losses, Less Than 12 Months, Fair Value	$ 184	$ 197
Unrealized Holding Losses, Less Than 12 Months, Unrealized Losses	4	7
Unrealized Holding Losses, 12 Months or More, Fair Value	0	0
Unrealized Holding Losses, 12 Months or More, Unrealized Losses	0	0
Unrealized Holding Losses Total, Fair Value	184	197
Unrealized Holding Losses Total, Unrealized Losses	4	7
Private Issue CMO
Schedule of Available-for-sale Securities [Line Items]
Unrealized Holding Losses, Less Than 12 Months, Fair Value	184	197
Unrealized Holding Losses, Less Than 12 Months, Unrealized Losses	4	7
Unrealized Holding Losses, 12 Months or More, Fair Value	0	0
Unrealized Holding Losses, 12 Months or More, Unrealized Losses	0	0
Unrealized Holding Losses Total, Fair Value	184	197
Unrealized Holding Losses Total, Unrealized Losses	$ 4	$ 7