 OLDWICK, N.J.--BUSINESS WIRE-- insurance--AM Best has affirmed the Financial Strength Rating of A Excellent and the Long-Term Issuer Credit Ratings Long-Term ICR of a Excellent of American Interstate Insurance Company Omaha, NE, Silver Oak Casualty, Inc. Omaha, NE and American Interstate Insurance Company of Texas Austin, TX collectively referred to as AMERISAFE Insurance Group or the group. Concurrently, AM Best has affirmed the Long-Term ICR of bbb Good of AMERISAFE, Inc. NASDAQ: 