Four Massachusetts banks were recently judged as among the healthiest in the nation, according to a measure known as the Texas ratio, the financial information firm Sageworks said.

Sageworks named First Commons Bank in Newton, Northmark Bank in North Andover and Winter Hill Bank in Somerville among the healthiest banks in the Northeast, with each having a Texas ratio of zero. Leader Bank in Arlington also made the list with a Texas ratio of 0.00169.

The Texas ratio measures a bank’s ability to cover bad loans with its tangible equity capital and is determined by dividing a bank’s non-performing assets by the sum of its tangible common equity and its loan loss reserves.

According to Sageworks, a Texas ratio between 0.5 and 1.0 is a warning sign and an even higher number indicates a bank may be in serious danger of failure.

“The institutions on each of these regional lists have taken on no or relatively low levels of problem loans and have adequate amounts of capital to cover them when there are any, which is a good indication of how these institutions are run,” James Noe, an analyst at Sageworks, said in the statement. “Troubled banks tend to get the most attention when it comes to generating Texas Ratio rankings, but it’s also constructive to highlight banks with strong ratios.”