Boise is similar to where Salt Lake was in the 1990s and 2000s: liberal city center but very conservative suburbs.
It certainly went Biden:
The big difference between Salt Lake/Ada is that Salt Lake County is diversifying fairly rapidly but it also has been turned off by Trumpism, while it looks like a great deal of the Boise area is embracing it. If Republicans had continued electing candidates like Mitt Romney nationally in 2016 and 2020, Salt Lake County would have been much closer (if not Republican).
But alas, Trump is toxic in the county (though, more appealing outside it). Even still, you can see the southern suburbs are conservative and more inline with Utah County:
Joe Biden won Salt Lake County 53-42.
But Biden won Salt Lake City 76-20, which is a significant margin.