A bit of a qualifier on this: the FDIC insures up to 250K per depositor (SSN/ITIN) at each bank and any deposits above that are going to resolved through a standard bankruptcy process of selling assets and going through the creditor tiers (employees, contractors, secured debtors such as depositors, uninsured depositors, preferred stock holders, common stock holders).
The two largest operating un-insured banks: BNY Mellon, Northern Trust, and State Street are custodial banks that primarily serve corporates. Citibank is uninsured from its large global operations where they are covered by *other* countries deposit insurance schemes. The numbers seem weird on everything else: CIBC, East West, and Frost for example, are all retail outlets and there high insured levels is suspicious
