EX-21.1 7 fibk-20171231xex211.htm SUBSIDIARIES OF FIRST INTERSTATE BANCSYSTEM, INC.
Exhibit 21.1
Subsidiaries of First Interstate BancSystem, Inc.

Subsidiary |  | State of Incorporation or Jurisdiction of Organization |  | Business Name
First Interstate Bank |  | Montana |  | First Interstate Bank
FI Statutory Trust I |  | Connecticut |  | FI Statutory Trust I
FI Capital Trust II |  | Delaware |  | FI Capital Trust II
FI Statutory Trust III |  | Delaware |  | FI Statutory Trust III
FI Capital Trust IV |  | Delaware |  | FI Capital Trust IV
FI Statutory Trust V |  | Delaware |  | FI Statutory Trust V
FI Statutory Trust VI |  | Delaware |  | FI Statutory Trust VI
Mountain South, LLC |  | Montana |  | Mountain South, LLC