When using popToRootViewController I lose my navigation bar

When using popToRootViewController I lose my navigation bar

I have an iOS app where the main screen is a UICollectionViewController.
When selecting an Item from the collection view the view is pushed to a
detail view of the item. In the detail view I built a drawer/slider that
moves out from the side. In order to get the view to look the way I wanted
I hid the default navigation bar and inserted one via storyboards.

I ran into an issue that when hiding the default navigation bar you lose
the back button functionality that comes with using a navigation
controller. I worked around this by adding a button where the back button
would have been (the image above is shown without the button). Now I use
the line of code below to move back to the collection view.
[self.navigationController popToRootViewControllerAnimated:YES];
It works the way I want it except that I lose my Navigation Bar when I
return to the collection view. Does anyone have any thoughts on how to fix
this? Thanks in advance!