banker

collective noun

is a fellow who lends you his umbrella when the sun is shining, but wants it back the minute it begins to rain.

A banker is a fellow who lends you his umbrella when the sun is shining, but wants it back the minute it begins to rain. Mark Twain

is a person who takes a lot of interest in his work.

is one who lends you an umbrella when it is not raining and asks you to return it when it is raining.

is a person whose job is essentially selling money