Summary of Significant Accounting Policies (Details) - USD ($)		12 Months Ended
	Apr. 30, 2019	Jun. 30, 2021
Impairment of Federal Home Loan Bank stock		$ 0
Consecutive period of employee's average month pay received to determine benefits under the Plan		5 years
Number of years of employment to determine pension benefit		10 years
TEB MHC
Shares of common stock sold	1,309,547
Price per share	$ 10.00
Percentage of outstanding shares issued	49.90%
Gross proceeds from issuance	$ 13,100,000
Net proceeds from issuance of common stock	11,400,000
Payments Of Initial Capitalization	$ 100,000
Number of shares held by mutual holding company	1,314,796
Percentage of outstanding shares held by mutual holding company	50.10%