Statewide, Idaho's median home price runs $481,825, 15% above the $420,000 national median. The 5.9x price-to-income ratio here is measured against a $81,166 median household income.
Idaho's 0.5% average property tax rate runs below the 1.1% national average, working out to $201/month on the median home here.
Idaho levies a state income tax of 5.3% flat on top of the $2,864/month this mortgage runs. Model your real after-tax take-home before deciding how much payment you can carry.
Idaho's cost of living index is 99, below the 100 national baseline. That's on top of the housing numbers above, not instead of them.
Idaho's median home price runs 1% higher than Montana: $475,191 there versus $481,825 here.