OLDWICK, N.J.–(BUSINESS WIRE)–A.M. Best has upgraded the Financial Strength Rating to B++ (Good) from B+ (Good) and the Long-Term Issuer Credit Rating to “bbb” from “bbb-” of CAMICO Mutual Insurance Company (CAMICO) (San Mateo, CA). The outlook of these Credit Ratings (ratings) has been revised to stable from positive. The ratings reflect CAMICO’s balance sheet strength, which A.M. Best categorizes as very strong, as well as its marginal operating performance, limited business profile and app