We live in a neighborhood, so the wildlife is VERY bold. I couldn't believe that it didn't fly off when DH banged on the glass. Even when we chase them, they don't really fly far. I've gotten them with the hose very frequently.
Over a year ago: We had a similar hawk (maybe same one) pull a bunch of quail through the wire of a rabbit cage (sitting on the floor deep inside the garage). It must have simply flown in via the open door and walk all the way to the back. The quail were too large to fit through the bars, so the hawk just kept grabbing parts. It was gruesome.
In November: I had a hawk attack my Spitzhauben when I was just 20' away. It landed on the Spitz and all I saw was a flapping mess of feathers. I was cleaning the run & chased it off with my pooper scooper. The hen took damage but survived.
Coopers and Sharp-Shinned are super hard to tell apart, but I think you're correct that it's a Coopers. It has a flat tail edge which would indicate Sharpie, but it seems quite large for them, and it has that large head with the sort-of-crest at the back and paler nape of the neck typical of Coopers, unless that's a trick of the light there. What I can tell you for sure is, regardless of whether it's a Sharpie or a Coopers, it's not a juvenile; that's adult plumage. Its familiarity makes me suspect that you have a return visitor. Those poor banties! Hopefully it doesn't have any luck this time around and it'll move on and forget about your place. 
