It probably will be lower, however, prices will increase after that and approaching the next dividend date. Many people buy for the dividend and sell after. This happens all the time. Think of this stock as a reliable interest income vehicle and disregard price fluctuations. In the past the range has been about 15 thru 17.
I don't see how you can be so sure. Today NYCB actually showed some life. If it was headed lower fast then a lot of people would have dumped today after the divi. I think there are a lot of people holding this for the divi. I really don't think this will end up with a 9% yield. I am not selling.