I'm not an entomologist at all, or even in Europe, so take my answer with a grain of salt.
I think this is a beetle of the long-horn beetles, which are all beetles that have a larval stage that borrow in wood. In particular I think this is in the genus Clytus and may be Clytus arietis, which is quite common in Europe and North America. There are other species in the genus that look pretty similar too (e.g. C. rhamni, so I can't be sure).
C. arietis is pretty small - about 10-18 mm, which looks about right for your hole size, and it has very similar patterns on its elytra. It is also hairy, as yours is. Apparently it is called the "wasp beetle" as it is a Batesian mimic, and may even make a buzzing noise when disturbed.