FDIC means you get paid immediately regardless, but the bank will almost invariably turn out to be good for the rest, just not quickly.
The first half is what FDIC insurance means. The FDIC helps distressed banks in a variety of ways, including insuring deposits under $250K, but typically all depositors are made mostly whole again.
Typically, but no guarantee. And on what time frame, nobody knows.
I suspect many depositors will be taking losses in this failure
https://www.ocregister.com/2009/03/20/depositor-losses-final...
In fact, to the extent ordinary bank failures don't result in paying back all or almost all of the sum owed, the regulator has been far too slow to step in and more aggressive regulation is needed.