Fair Value of Financial Instruments - Nonrecurring Level 3 Fair value measurements (Details)	Dec. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)
Fair Value Assets and Liabilities measured on Recurring and Nonrecurring basis valuation techniques
Other real estate owned, net	$ 167,590	$ 167,590
Non-recurring
Fair Value Assets and Liabilities measured on Recurring and Nonrecurring basis valuation techniques
Impaired loans with a valuation allowance, net	108,652	116,906
Other real estate owned, net	167,590	167,590
Level 3 | Non-recurring
Fair Value Assets and Liabilities measured on Recurring and Nonrecurring basis valuation techniques
Impaired loans with a valuation allowance, net	108,652	116,906
Other real estate owned, net	167,590	167,590
Market price or appraised value | Discount on appraised values for selling costs | Level 3 | Non-recurring
Fair Value Assets and Liabilities measured on Recurring and Nonrecurring basis valuation techniques
Impaired loans with a valuation allowance, net	108,652	116,906
Other real estate owned, net	$ 167,590	$ 167,590
Market price or appraised value | Discount on appraised values for selling costs | Minimum | Level 3 | Non-recurring
Fair Value Assets and Liabilities measured on Recurring and Nonrecurring basis valuation techniques
Impaired loans with a valuation allowance, net, measurement input	0.05	0.05
Other real estate owned, net, measurement input	0.05	0.05
Market price or appraised value | Discount on appraised values for selling costs | Maximum | Level 3 | Non-recurring
Fair Value Assets and Liabilities measured on Recurring and Nonrecurring basis valuation techniques
Impaired loans with a valuation allowance, net, measurement input	0.15	0.15
Other real estate owned, net, measurement input	0.15	0.15