Rockingham Casualty Co, based in Harrisonburg, Va., had its financial strength rating and issuer credit rating upgraded after it became a fully reinsured affiliate of Rockingham Mutual Insurance Co.

A.M. Best Co. said a quota share agreement that took effect Jan. 1 led to the ratings changes. That agreement was part of an affiliate arrangement between Rockingham Casualty, and its parent company, Rockingham Mutual, also based in Harrisonburg. The two companies together form the Rockingham Group.

The upgrades also reflect the strong levels of risk-adjusted capitalization and operating performance, as well as the product and distribution synergies, it offers the group, A.M. Best said in a statement.

Rockingham Casualty’s financial strength rating rose to “A” (Excellent), from “A-,” while the issuer credit rating increased to “a,” from “a-,” the ratings service said.

More than 80 insurance agents represent Rockingham, which provides personal lines coverages in Virginia and Pennsylvania.