Fair Value of Financial Instruments - Non-recurring (Details) - USD ($)	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned, net	$ 167,590	$ 167,590
Carrying value of impaired loans	202,483	205,665	$ 437,807
Impaired loans - related allowance	88,585	88,759	$ 180,537
Non-recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with a valuation allowance, net	113,899	116,906
Other real estate owned, net	167,590	167,590
Total	281,489	284,496
Non-recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with a valuation allowance, net	0	0
Other real estate owned, net	0	0
Total	0	0
Non-recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with a valuation allowance, net	0	0
Other real estate owned, net	0	0
Total	0	0
Non-recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with a valuation allowance, net	113,899	116,906
Other real estate owned, net	167,590	167,590
Total	$ 281,489	$ 284,496