What type of institutions does the FDIC mainly supervise in its risk management division?

The Federal Deposit Insurance Corporation (FDIC) primarily supervises state-chartered banks that are not members of the Federal Reserve System as part of its risk management division. This focus is rooted in the fact that state-chartered banks that do not join the Federal Reserve System do not have direct oversight from the Federal Reserve, making them primarily subject to FDIC supervision.

The FDIC's role includes ensuring the safety and soundness of these institutions, protecting depositors, and maintaining public confidence in the banking system. By focusing on this category of banks, the FDIC can effectively monitor and address any potential risks that could arise within the banking sector, as these banks may not receive oversight from other federal regulators.

Given that the other options include credit unions, Federal Reserve member banks, and international banks, these institutions fall under different regulatory frameworks, largely supervised by other agencies such as the National Credit Union Administration (NCUA) for credit unions or the Federal Reserve for member banks. Thus, the FDIC's primary supervisory authority is rightly concentrated on state-chartered banks that are not members of the Federal Reserve System.