Hutchinson was very well-liked in his House district and racked up DPRK-level margins in NW Arkansas.
Sometimes if you can knock it out of the park in one part of the state, it makes up for a meh showing elsewhere. (See also: Doug Jones winning the 2017 US Senate election in Alabama.)
Its worth noting that Doug Jones winning only 1 congressional district in 2017 while winning statewide was the product of gerrymandering; under nonpartisan maps, he would have won 3, which while still a minority, shows that his win was not based on domination in just a single area.