NEW YORK–(BUSINESS WIRE)–Kroll Bond Rating Agency (KBRA) assigns a senior unsecured debt rating of BBB, subordinated debt rating of BBB-, and short-term debt rating of K3 for Hattiesburg, Mississippi based The First Bancshares, Inc., (NASDAQ: FBMS). KBRA also assigns deposit and senior unsecured debt ratings of BBB+, a subordinated debt rating of BBB, and short-term deposit and debt ratings of K2 to its subsidiary, The First, A National Banking Association. The Outlook for all long-term ratin