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First Interstate BancSystem (FIBK)

Cover

CoverAug. 19, 2021
Cover [Abstract]
Document Type8-K
Document Period End DateAug. 19,
2021
Entity Registrant NameFIRST INTERSTATE BANCSYSTEM, INC.
Entity Incorporation, State or Country CodeMT
Entity File Number001-34653
Entity Tax Identification Number81-0331430
Entity Address, Address Line One401 North 31st Street
Entity Address, City or TownBillings,
Entity Address, State or ProvinceMT
Entity Address, Postal Zip Code59116-0918
City Area Code(406)
Local Phone Number255-5390
Written Communicationsfalse
Soliciting Materialfalse
Pre-commencement Tender Offerfalse
Pre-commencement Issuer Tender Offerfalse
Title of 12(b) SecurityClass A common stock, no par value
Trading SymbolFIBK
Security Exchange NameNASDAQ
Amendment Flagfalse
Entity Central Index Key0000860413
Entity Emerging Growth Companyfalse