Humana wasn't kidding when it hinted last week of big premium hikes for 2017 in those ObamaCare markets where it remains. This year, the nation's fifth-largest insurer offers the cheapest bronze and silver plans in Michigan's largest market, including Detroit. But Humana has filed for a 50% premium hike for its low-cost silver plan. Meanwhile, Humana wants a 38% premium increase for its lowest-cost bronze plan. So far only Oregon, where insurers are requesting an average 27% premium hike, and Virginia, where insurers want an 18% hike, are the only two states to make all rate filings available.