That is a matter of state law and/or any contractual agreements you may have with the terminated employee.
TN, for example, is a work at will state. If you leave employment for whatever reason before the incentive payment is paid, you are not entitled to it, unless there is a contract that specifically provides for it. Most employers in TN do not issue written contracts. It would be solely left to the bank's discretion to pay it. Hourly wages/salary would only be paid for time worked. Any other commission/bonus/etc would only be paid if the person was an employee at the time the payment is made.
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I can't herd the cats anymore, so I just set up the electric fences and let them fry when they stray out of bounds.