Premises and Equipment - Components (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021
Property, Plant and Equipment [Line Items]
Gross value	$ 18,247	$ 17,991
Accumulated depreciation	(4,783)	(4,552)
Net book value	13,464	13,439
Land
Property, Plant and Equipment [Line Items]
Gross value	2,581	2,581
Office buildings and improvements
Property, Plant and Equipment [Line Items]
Gross value	13,100	12,932
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Gross value	2,516	2,428
Automobiles
Property, Plant and Equipment [Line Items]
Gross value	$ 50	$ 50