What do business customers do with their money if the amounts are large?

Our business, for example, has grown for many years and we now have over 400k in our bank. Now we're not insured for anything over 100k, right? But if we take money out to feel safe (cash) we're laundering or structuring. If we write a check to another bank for 100k and open an account we'll be reported, I was told, either by a person filing a report or a banks software.
Even if we could just write checks and open accounts at other banks, not all banks in town are "safe". We don't really want to put money into WaMu or Wachovia right now.

So what do businesses with money do to keep it safe?

You have coverage up to $250,000 in an FDIC insured account. You can spread your money into more than one bank. DO NOT WORRY about moving a large sum unless you are hiding something. Ask bank A to wire it to bank B. You'll spread your money, make two banks happy, be completely insured and life will be good.

If you are worried about making sure your money is insured you may want to look into a CDARS account. The CDARS (Certificate of Deposit Account Registry System) program allows you to deposit money into numerous banks while dealing with only one bank. You may deposit up to $50 million and receive full FDIC insurance on the entire amount. All your deposits will earn the same rate and you'll receive a monthly statement summarizing all of your accounts. You may also choose banks that you wish your money not be invested in upon entering into the CDARS program.

[Poster's contact information removed as a form of advertising. For information on the CDARS program, click on http://www.cdars.com.]