Unusual Swallow Species

Observation: I saw this swallow outside my home on power lines in Noorvik. This is the first time I have seen this color swallow. We have the tree and bank swallows, I'm wondering if this is a juvenile swallow of either or another specie of swallow. I have a bird house outside my home and at camp for over twenty years and never seen this color swallow before. I asked around if anyone had seen this color of swallow before, but nobody have. The swallow flew off before I could see front.