Summary of Significant Accounting Policies (Details) - TEB MHC	Apr. 30, 2019 USD ($) $ / shares shares
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 from issuance of common stock	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%