There are far too many variables for any of us to be able to say if it is fair or not. Bank size, bank condition, product lines, overall pay scale of the institution, etc. Also benefits, working conditions, co-workers, commute time, and other personal factors.
The only one whose opinion matters, really, is you. If you think it's not fair, it may be time to move on.
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I can explain it to you. I can't understand it for you.