<SEC-DOCUMENT>0000860413-17-000033-index.html : 20170922
<SEC-HEADER>0000860413-17-000033.hdr.sgml : 20170922
<ACCEPTANCE-DATETIME>20170922171551
ACCESSION NUMBER:		0000860413-17-000033
CONFORMED SUBMISSION TYPE:	POS AM
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20170922
DATE AS OF CHANGE:		20170922

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FIRST INTERSTATE BANCSYSTEM INC
		CENTRAL INDEX KEY:			0000860413
		STANDARD INDUSTRIAL CLASSIFICATION:	STATE COMMERCIAL BANKS [6022]
		IRS NUMBER:				810331430
		STATE OF INCORPORATION:			MT
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		POS AM
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-188865
		FILM NUMBER:		171098209

	BUSINESS ADDRESS:	
		STREET 1:		P O BOX 30918
		STREET 2:		401 NO 31ST STREET
		CITY:			BILLINGS
		STATE:			MT
		ZIP:			59116-0918
		BUSINESS PHONE:		4062555300

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FIRST INTERSTATE BANCSYSTEM OF MONTANA INC
		DATE OF NAME CHANGE:	19930615
</SEC-HEADER>
<DOCUMENT>
<TYPE>POS AM
<SEQUENCE>1
<FILENAME>a20170922-posam1.htm
<DESCRIPTION>POS AM
<TEXT>
Document 1 - file: a20170922-posam1.htm

</DOCUMENT>
</SEC-DOCUMENT>