Summary of Significant Accounting Policies (Details)	1 Months Ended	3 Months Ended	12 Months Ended
	Apr. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2019 USD ($) item	Jun. 30, 2019 USD ($)	Feb. 15, 2012
Payments Of Initial Capitalization			$ 100,000
Cost of the reorganization and the issuing of the common stock, deferred		$ 1,649,899
Employee's average monthly pay in number of consecutive calendar years | item		5
Number of years of employment		10 years
Minimum Tier 1 capital of average assets		4.00%	4.00%	8.00%
Minimum total risk-based capital of risk weighted assets, revising capital plan submitted to FDIC and WDFI		6.00%	6.00%	12.00%
Maximum
Annual gross revenues			$ 1,070,000,000
TEB MHC
Shares of common stock sold | shares	1,309,547
Price per share | $ / shares	$ 10.00
Percentage of outstanding shares issued	49.90%
Gross proceeds from issuance	$ 13,100,000
Net proceeds received after offering costs	11,400,000
Payments Of Initial Capitalization	$ 100,000
Number of shares held by mutual holding company | shares	1,314,796
Percentage of outstanding shares held by mutual holding company	50.10%
Cost of the reorganization and the issuing of the common stock, deferred		$ 1,649,899