OLDWICK, N.J.–(BUSINESS WIRE)–A.M. Best has downgraded the Financial Strength Rating to A- (Excellent) from A (Excellent) and the Long-Term Issuer Credit Rating to “a-” from “a” of Bear River Mutual Insurance Company (Bear River) (Murray, UT). The outlook of these Credit Ratings (ratings) remains negative. The rating actions reflect the company’s significant underwriting losses reported in 2015 and 2016. In addition, the rating actions also reflect the declining trend in risk-adjusted capital