I'm a long distance cyclist (100 miles/week when in season) who does centuries and longer rides a few times a year. I ride 2500-3000 miles/year and lift a few times a week (deadlift/bench/others, plus a lot of stretching).
Congrats on doing lifting; cycling is great for cardio but can lead to postural and other issues, and weightlifting can help.
There isn't a simple answer to your question. It depends on how you are lifting, what you are eating, and what kind of rides you are taking. The term "cycling" spans such a broad range of activity intensities and durations that it's impossible to generalize. Some people think 60 minutes on a flat trail at 12MPH is a good ride. For others, it's 75 miles and 5000' of climbing.
If your rides are 90 minutes or less and you are riding at a reasonable pace (say, 15 MPH or so), you aren't going to be burning enough calories for it to be much of an issue.
On the other hand, there is nothing like hard endurance cycling - and by that I mean 19-20MPH on the flats and a lot of hills for 3-5 hours - to melt the muscle off of you.
If you are in between, you will put some of your muscle gains at risk, but lifting will reduce the effect of the riding. You may not gain a lot of muscle during the part of the year you ride a lot, but lifting will keep from losing it.
I also recommend being really careful with nutrition. Have a stream of calories (300ish/hour) while you ride will help, and making sure to have something for recovery when you finish will also help; when you finish your glycogen levels are low, and if you don't replenish them, your body will tear down some muscle. Chocolate milk works well if you tolerate lactose well; I use Endurox.
I will note that it's hard to do deadlift or squats and ride at the same time. My legs are much more tired than usual, and when I'm getting ready for a goal ride I stop lifting.