RedactedNarrative: Vessel was drifting to dock.  Operator was sitting at door at starboard side of the boat and slid into water to hold boat to pier.  As the Operator exited the driver's side door, he caught his hand on the door hinge resulting in tearing off the right 5th finger.  The finger remained at the location of amputation at the hinge dowel.  The door hinge had a dowel pin that was extended above the hinge.  Operator was air lifted to hospital where he underwent revision surgery as the finger was not able to be reattached.