You want me to google for you? You don't seem serious. Here you go anyway with 5 out of the top 6 links on the first page from Google.com. Hopefully, these links will help someone who is looking for information on how to secure their bank account.

The normal method for this insurance is to call an insurance company and ask for excess deposit insurance. This should be your first step. But, it seems very strange to me that you are beligerently asking people on the internet for financial information that you don't appear to need.

  1. Understand How a Depositor Bond Works [1]
  2. Depositor bonds for FDIC-insured deposit accounts [2]
  3. Excess Deposit Guarantee Surety Bond [3]
  4. Bond Penalty: Based on Coverage Requested Excess FDIC Limits [4]
  5. Hello old friend – The reappearance of excess deposit bonds [5]

Here is the summary copied from the first link, in case you don't want to load the link from here or from Google.

  In summary, the Depositor Bond provides a third
  party guarantee (from the insurance company who
  is called the Surety) that deposits will in fact
  be returned to the depositor.  Depositor bonds
  are designed to be “Excess FDIC Insurance
  Coverage” and coverage begins at the point where
  the $250,000 FDIC insurance obligation ends. [1] 

 

[1] https://www.depositorbonds.com/understand-how-a-depositor-bo...

[2] https://www.travelers.com/iw-documents/surety-bond/59375-dep...

[3] https://surety1.com/bond_info/excess-deposit-guarantee-suret...

[4] https://suretyone.com/bank-depository-bond

[5] https://www.cuinsight.com/hello-old-friend-the-reappearance-...