Why are bank tellers so nosy?

I was depositing money and this dude was asking me a million questions.

I asked him 'Why do you want to pay for my dinner?' and he said 'No, just making small talk.'

Then, he gave me my receipt and balance and looked at my balance.

WTF? Just do your job. I'm not here to be your friend. You're an employee.
Why are bank tellers so nosy?
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