In all fairness, those of you downvoting the parent need to address the following:
The FDIC receives no Congressional appropriations – it is funded by premiums that banks and thrift institutions pay for deposit insurance coverage and from earnings on investments in U.S. Treasury securities.
I remember there being some talk about FDIC potentially needing to borrow from the Treasury during the financial crisis however as far as I know, it didn't happen.
That's a bit like the way Fannie and Freddie received no direct appropriations... before they collapsed. They had an implicit guarantee, which was worth just as much as cash, and wound up costing a lot.
When people trust the FDIC, it's not based on the idea that they're an independent entity charging sufficient premiums to handle any eventuality. They're not; they predict they will be below their legally-required reserve level through 2017 and not hit their target reserve level until 2027 (with rosy economic assumptions):
The FDIC receives no Congressional appropriations – it is funded by premiums that banks and thrift institutions pay for deposit insurance coverage and from earnings on investments in U.S. Treasury securities.
Source: http://www.fdic.gov/about/learn/symbol/index.html
I remember there being some talk about FDIC potentially needing to borrow from the Treasury during the financial crisis however as far as I know, it didn't happen.