A bank manager is a financial sales person who exists to achieve his sales targets and get a nice bonus.
All sales people are nice to people that they sell too.. cultivating the opportunity, building trust/empathy, acting friendly are all tools used by sales people/account managers to achieve the sale when all they have may be the feeling or perception to differentiate between what are identical offers (or theirs may actually be worse).
If I sound cold, that's because I deal with a global sales force every day - I love them to bits. Honest.