OLDWICK, N.J.--(BUSINESS WIRE)--A.M. Best has assigned a financial strength rating (FSR) of A- (Excellent) and an issuer credit rating (ICR) of “a-” to Little River Insurance Company (Little River) (Goldsboro, NC).The outlook assigned to both ratings is stable. A.M. Best also has affirmed the FSR of A- (Excellent) and the ICR of “a-” of Atlantic Casualty Insurance Company (Atlantic Casualty) (Goldsboro, NC). The outlook for both ratings is stable. The ratings assigned to Little River are the re