Gosh you must live in a mild climate! Mine are still only 6" tall after being mostly killed by a late freeze.

Looks like a standard-issue hyd mac Nikko Blue or something from that general family. Pastels and large blooms can also be found on such common issues as Endless Summer and cousins, All Summer Beauty, etc.

I am in North Carolina. Thank you for the ID. I am excited to see these bloom since they did not bloom last year. And they had been pruned before we bought the house last year and we also had a colder than normal winter in 2015.

Very nice! They're robably some standard issue specimens like Nikko Blue, Glowing Embers (pink) and Sister Theresa (white). More likely than not. Also pay attention to the aging bloom colors and fall foliage color. The pink one might be something more unique like Merveille Sanguine (Color Fantasy) if it turns bronze. Aside from that, there are whole books full of Mac cultivars so unless there are tags somewhere you might never know what they are.

Do note that Nikkos will easily engulf Glowing Embers if close by so you might opt to move that one elsewhere.

Wish I had more shady space! Nice pictures, nchomegarden.

Since the first flush of blooms, there hasn't been another flush and I do not see any buds either. Is that it for this hydrangea? Do I need to remove the fading blooms to encourage more blooms? Or feed it fertilizer or is this normal - just one big flush of blooms? The blooms do still have some charm left even if they are fading...

If they have some 'charm left', then leave the blooms there and wait to see if you get any more new blooms (proving or disproving that the plant is a rebloomer). But that may happen later, when temps get cooler.

But definitely do not fertilize. Try to stop at the end of June to make sure that the plant will go dormant at its proper time. If not, early frosts might zap the invisible flower buds that mopheads develop between July and August for Spring 2017.

This is what they look like now -

As said above, there are a few H. macrophylla that are rebloomers, but the majority are spring bloomers only. You can cut off the dead blooms if they bother you, but at this time of year you don't want to cut any lower since next year's flower buds have formed and you don't want to cut them off. Now that you've seen that they only bloom once, if you don't like the look of the faded flowers you can prune off as soon as their appearance bothers you.