Bank insurance is a type of financial protection that covers a bank's assets in the event of a natural disaster, such as a flood or earthquake. It is also known as LEVEE insurance, which is the crossword solution for the term 'bank insurance'. LEVEE insurance is designed to protect banks from losses due to flooding, and can be purchased from private insurers or from government-sponsored programs. This type of insurance is important for banks, as it helps them to remain financially secure in the event of a natural disaster.