Its condensation burning off from the exhaust system as well as water being exited to the atmosphere. This is one of the components the cat convertor "makes," H2O.
A vapor will be more noticable at idle than at a higher rpm, especially if there is no load on the engine, meaning you're not driving it.
Next time you're behind a Ford Crown Vic, Merc Town Car, etc., look at the tailpipes, water is dribbling out, especially if it is sitting at a stoplight waiting for the green light.
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CUBS - 2016 World Series Champions - Thank you, Joe Madden … enjoy your next chapter.