NEW YORK–(BUSINESS WIRE)–Kroll Bond Rating Agency (KBRA) has assigned a senior unsecured debt rating of BBB+, subordinated debt rating of BBB, and short-term debt rating of K2 to Billings, Montana based First Interstate BancSystem, Inc. (NASDAQ: FIBK)(“the Company”). KBRA has also assigned deposit and senior unsecured debt ratings of A-, a subordinated debt rating of BBB+, and short-term deposit and debt ratings of K2 to the lead subsidiary, First Interstate Bank. The Outlook on all long-term
