You have a difficult decision to make, although it may not matter whether you sign the “agreement” or not. If you continue to work after you are informed that a forced arbitration agreement governs your employment, you may be bound by it, even if you refuse to sign it.
This means that any disputes between customers and banks over account fees, identity theft, or other charges will be decided by an arbitrator that the bank helps choose, rather than an impartial judge.
If neither party appeals the decision, it will be binding, like an order by a judge. However, a party unhappy with the arbitrator's decision can request a new trial before a judge.
Opting out of the arbitration agreement isn't damaging to you. You can always do arbitration if you would prefer that, although if you'd like to join class actions or sue the judge will throw out your case if you are still in this agreement.
Arbitration might be the right choice for some cases. Limited discovery rights and costs might be useful when less is at stake. Arbitration might feel less adversarial, which could be an advantage where ongoing relationships are hoped to be preserved. Arbitration lends some confidentiality.
If you include an arbitration clause in your contract, you might want to specify the rules for the arbitration proceeding. You can be vague in your rules. For example, you can simply say that the arbitration is: binding.