<SEC-DOCUMENT>0000950103-21-020141.txt : 20211223
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<ACCEPTANCE-DATETIME>20211222194727
ACCESSION NUMBER:		0000950103-21-020141
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		15
CONFORMED PERIOD OF REPORT:	20211222
ITEM INFORMATION:		Other Events
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20211223
DATE AS OF CHANGE:		20211222

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:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-34653
		FILM NUMBER:		211514457

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

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

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FIRST INTERSTATE BANCSYSTEM OF MONTANA INC
		DATE OF NAME CHANGE:	19930615
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<p style="margin: 0">&#160;</p>

<p style="font: 14pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b>UNITED STATES</b></p>

<p style="font: 14pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b>SECURITIES AND EXCHANGE COMMISSION</b></p>

<p style="font: 12pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b>Washington D.C. 20549</b></p>
<p style="margin-top: 0; text-align: center; margin-bottom: 0"><span style="font-size: 10pt">____________________________</span></p>
<p style="margin: 0">&#160;</p>


<p style="font: 12pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b></b></p>

<p style="font: 12pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></p>

<p style="font: 18pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b>FORM <span id="xdx_90A_edei--DocumentType_c20211222__20211222_zAvyrLr2Urdd"><ix:nonNumeric contextRef="From2021-12-22to2021-12-22" name="dei:DocumentType">8-K</ix:nonNumeric></span></b></p>
<p style="margin-top: 0; text-align: center; margin-bottom: 0"><span style="font-size: 10pt">____________________________</span></p>
<p style="margin: 0">&#160;</p>


<p style="font: 12pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b></b></p>

<p style="font: 12pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></p>

<p style="font: 14pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b>CURRENT REPORT</b></p>

<p style="font: 14pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&#160;</p>

<p style="font: 12pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b>Pursuant to Section 13 or 15(d) of the Securities
Exchange Act of 1934</b></p>

<p style="font: 12pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&#160;</p>

<p style="font: 12pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b>Date of report (date of earliest event
reported): December 23, 2021 (<span id="xdx_90E_edei--DocumentPeriodEndDate_c20211222__20211222_zPaqwdQWKja4"><ix:nonNumeric contextRef="From2021-12-22to2021-12-22" format="ixt:datemonthdayyearen" name="dei:DocumentPeriodEndDate">December 22,
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<p style="font: 12pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">____________________________</p>

<p style="font: 12pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&#160;</p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b>(Exact name of registrant as specified in its
charter)</b></p>

<p style="font: 12pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">____________________________</p>

<p style="font: 12pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&#160;</p>

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    <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">File No.)&#160;</p></td>
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    <p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">Identification No.)</p>
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<p style="margin: 0">&#160;</p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&#160;</p>

<p style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b>(<span id="xdx_905_edei--CityAreaCode_c20211222__20211222_zsjiH9RFcBmd"><ix:nonNumeric contextRef="From2021-12-22to2021-12-22" name="dei:CityAreaCode">406</ix:nonNumeric></span>) <span id="xdx_90A_edei--LocalPhoneNumber_c20211222__20211222_zsQlQ1vQQVn2"><ix:nonNumeric contextRef="From2021-12-22to2021-12-22" name="dei:LocalPhoneNumber">255-5390</ix:nonNumeric></span></b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Registrant&#8217;s telephone number, including
area code)</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&#160;</p>

<p style="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b>Not Applicable</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Former name or former address, if changed since
last report)</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Check the appropriate box below if the Form 8-K filing is intended
to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (<span style="text-decoration: underline">see</span> General Instruction
A.2. below):</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

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<td style="width: 0in"></td><td style="width: 0.25in; text-align: left"><span id="xdx_903_edei--WrittenCommunications_dxL_c20211222__20211222_zJWfENGGrdl7" title="::XDX::true"><span style="-sec-ix-hidden: xdx2ixbrl0021">&#9746;</span></span></td><td><span style="font-family: Times New Roman, Times, Serif">Written
communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</span></td>
</tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; width: 100%"><tr style="vertical-align: top">
<td style="width: 0in"></td><td style="width: 0.25in; text-align: left"><span id="xdx_901_edei--SolicitingMaterial_c20211222__20211222_zV1YCRXLtb6c"><ix:nonNumeric contextRef="From2021-12-22to2021-12-22" format="ixt:booleanfalse" name="dei:SolicitingMaterial">&#9744;</ix:nonNumeric></span></td><td><span style="font-family: Times New Roman, Times, Serif">Soliciting
material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a- 12)</span></td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; width: 100%"><tr style="vertical-align: top">
<td style="width: 0in"></td><td style="width: 0.25in; text-align: left"><span id="xdx_90F_edei--PreCommencementTenderOffer_c20211222__20211222_zgzGtJktUQUj"><ix:nonNumeric contextRef="From2021-12-22to2021-12-22" format="ixt:booleanfalse" name="dei:PreCommencementTenderOffer">&#9744;</ix:nonNumeric></span></td><td><span style="font-family: Times New Roman, Times, Serif">Pre-commencement
communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</span></td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

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<td style="width: 0in"></td><td style="width: 0.25in; text-align: left"><span id="xdx_900_edei--PreCommencementIssuerTenderOffer_c20211222__20211222_zaRtvpxiXgQ5"><ix:nonNumeric contextRef="From2021-12-22to2021-12-22" format="ixt:booleanfalse" name="dei:PreCommencementIssuerTenderOffer">&#9744;</ix:nonNumeric></span></td><td><span style="font-family: Times New Roman, Times, Serif">Pre-commencement
communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</span></td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><b>Securities registered pursuant to Section 12(b) of the Act:</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

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    <td style="text-align: center; width: 33%"><span style="font: 10pt Times New Roman, Times, Serif"><b><span style="text-decoration: underline">Name of exchange on which registered</span></b></span></td></tr>
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    <td style="vertical-align: top; text-align: center"><span style="font: 10pt Times New Roman, Times, Serif"><span id="xdx_90E_edei--Security12bTitle_c20211222__20211222_zj5a73YQhHO3"><ix:nonNumeric contextRef="From2021-12-22to2021-12-22" name="dei:Security12bTitle">Class A common stock, no par value</ix:nonNumeric></span></span></td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Indicate by check mark whether the registrant is an emerging growth
company as defined in Rule 405 of the Securities Act of 1933 (&#167;230.405 of this chapter) or Rule 12b-2 of the Securities Exchange
Act of 1934 (&#167;240.12b-2 of this chapter).</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Emerging growth company <span id="xdx_90C_edei--EntityEmergingGrowthCompany_c20211222__20211222_zLb01VGIzpO8"><ix:nonNumeric contextRef="From2021-12-22to2021-12-22" format="ixt:booleanfalse" name="dei:EntityEmergingGrowthCompany">&#9744;</ix:nonNumeric></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">If an emerging growth company, indicate by check mark if the registrant
has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant
to Section 13(a) of the Exchange Act. &#9744;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><b>Item 8.01. Other Events.</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">On December 22, 2021, First Interstate BancSystem Inc. (&#8220;FIBK&#8221;)
and Great Western Bancorp, Inc. (&#8220;GWB&#8221;) announced that they have received regulatory approval from the Board of Governors
of the Federal Reserve System and the Montana Division of Banking to complete the previously announced business combination transaction
(the &#8220;Transaction&#8221;) between FIBK and GWB pursuant to the Agreement and Plan of Merger dated as of September 15, 2021, by and
between FIBK and GWB.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Completion of the Transaction remains subject to customary closing
conditions, including regulatory approval from the Division of Banking of the South Dakota Department of Labor and Regulations and receipt
of the requisite approvals of the shareholders of FIBK and stockholders of GWB at their upcoming special meetings on January 19, 2022.
Assuming such conditions are satisfied, the Transaction is expected to close in February 2022.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">On December 22, 2021, FIBK and GWB issued a joint press release announcing
the foregoing matters. A copy of the press release is attached as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated
herein by reference.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<table cellpadding="0" cellspacing="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; margin-top: 0pt; margin-bottom: 0pt"><tr style="vertical-align: top">
<td style="width: 0"></td><td style="width: 1in"><b>Item 9.01.</b></td><td><b>Financial Statements and Exhibits.</b></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><b>(d) Exhibits</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <tr style="vertical-align: bottom">
    <td style="padding-top: 2pt; white-space: nowrap; padding-right: 2pt; padding-bottom: 2pt">
    <p style="border-bottom: black 0.75pt solid; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><b>Exhibit No.&#160;</b></p></td>
    <td style="padding-top: 2pt; padding-right: 2pt; padding-bottom: 2pt">&#160;</td>
    <td style="padding-top: 2pt; padding-right: 2pt; padding-bottom: 2pt">
    <p style="border-bottom: black 0.75pt solid; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><b>Description of Exhibit&#160;</b></p></td></tr>
  <tr>
    <td style="padding-top: 2pt; white-space: nowrap; padding-right: 2pt; padding-bottom: 2pt; width: 10%"><a href="dp164067_ex9901.htm"><span style="font: 10pt Times New Roman, Times, Serif">99.1</span></a></td>
    <td style="padding-top: 2pt; width: 4%; padding-right: 2pt; padding-bottom: 2pt">&#160;</td>
    <td style="padding-top: 2pt; padding-right: 2pt; padding-bottom: 2pt; width: 86%"><a href="dp164067_ex9901.htm"><span style="font: 10pt Times New Roman, Times, Serif">Joint Press Release of First Interstate BancSystem, Inc. and Great Western Bancorp, Inc., dated December 22, 2021.</span></a></td></tr>
  <tr>
    <td style="border-bottom: Black 1pt solid; padding-top: 2pt; white-space: nowrap; padding-right: 2pt; padding-bottom: 2pt"><span style="font: 10pt Times New Roman, Times, Serif">104</span></td>
    <td style="border-bottom: Black 1pt solid; padding-top: 2pt; padding-right: 2pt; padding-bottom: 2pt">&#160;</td>
    <td style="border-bottom: Black 1pt solid; padding-top: 2pt; padding-right: 2pt; padding-bottom: 2pt"><span style="font: 10pt Times New Roman, Times, Serif">The cover page from this Current Report on Form 8-K, formatted in Inline XBRL.</span></td></tr>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><b>Cautionary Note Regarding Forward Looking Statements </b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">This communication contains &#8220;forward-looking statements&#8221;
within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the
Securities Exchange Act of 1934, as amended, and Rule 3b-6 promulgated thereunder, which involve inherent risks and uncertainties. Any
statements about FIBK&#8217;s, GWB&#8217;s or the combined company&#8217;s plans, objectives, expectations, strategies, beliefs, or future
performance or events constitute forward-looking statements. Such statements are identified as those that include words or phrases such
as &#8220;believes,&#8221; &#8220;expects,&#8221; &#8220;anticipates,&#8221; &#8220;plans,&#8221; &#8220;trend,&#8221; &#8220;objective,&#8221;
&#8220;continue,&#8221; or similar expressions or future or conditional verbs such as &#8220;will,&#8221; &#8220;would,&#8221; &#8220;should,&#8221;
&#8220;could,&#8221; &#8220;might,&#8221; &#8220;may,&#8221; or similar expressions. Forward-looking statements involve known and unknown
risks, uncertainties, assumptions, estimates, and other important factors that change over time and could cause actual results to differ
materially from any results, performance, or events expressed or implied by such forward-looking statements. Such forward-looking statements
include but are not limited to statements about the benefits of the Transaction, including future financial and operating results, the
combined company&#8217;s plans, objectives, expectations and intentions, and other statements that are not historical facts.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">These forward-looking statements are subject to risks and uncertainties
that may cause actual results to differ materially from those projected. In addition to factors previously disclosed in FIBK&#8217;s and
GWB&#8217;s reports filed with the U.S. Securities and Exchange Commission (the &#8220;SEC&#8221;) and those identified elsewhere in this
document, the following factors, among others, could cause actual results to differ materially from forward-looking statements or historical
performance: the occurrence of any event, change, or other circumstance that could give rise to the right of one or both of the parties
to terminate the definitive merger agreement between FIBK and GWB; the outcome of any legal proceedings that may be instituted against FIBK or GWB; the possibility that
the Transaction does not close when expected or at all because required regulatory, shareholder or other approvals and other conditions
to closing are not received or satisfied on a timely basis or at all (and the risk that such approvals may result in the imposition of
conditions that could adversely affect the combined company or the expected benefits of the Transaction); the risk that the benefits from
the Transaction may not be fully realized or may take longer to realize than expected, including as a result of changes in, or problems
arising from, general economic and market conditions, interest and exchange rates, monetary policy, laws and regulations and their enforcement,
and the degree of competition in the geographic and business areas in which FIBK and GWB operate; the ability to promptly and effectively
integrate the businesses of FIBK and GWB; the possibility that the Transaction may be more expensive to complete than anticipated, including
as a result of unexpected factors or events; reputational risk and potential adverse reactions of FIBK&#8217;s or GWB&#8217;s customers,
employees or other business partners, including those resulting from the announcement or completion of the Transaction; the dilution caused
by FIBK&#8217;s issuance of additional shares of its capital stock in connection with the Transaction; the diversion of management&#8217;s
attention and time from ongoing business operations and opportunities on merger-related matters; and the impact of the global COVID-19
pandemic on FIBK&#8217;s or GWB&#8217;s businesses, the ability to complete the Transaction or any of the other foregoing risks.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">These factors are not necessarily all of the factors that could cause
FIBK&#8217;s, GWB&#8217;s or the combined company&#8217;s actual results, performance, or achievements to differ materially from those
expressed in or implied by any of the forward-looking statements. Other unknown or unpredictable factors also could harm FIBK&#8217;s,
GWB&#8217;s or the combined company&#8217;s results.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">All forward-looking statements attributable to FIBK, GWB, or the
combined company, or persons acting on FIBK&#8217;s or GWB&#8217;s behalf, are expressly qualified in their entirety by the
cautionary statements set forth above. Forward-looking statements speak only as of the date they are made and FIBK and GWB do not
undertake or assume any obligation to update publicly any of these statements to reflect actual results, new information or future
events, changes in assumptions, or changes in other factors affecting forward-looking statements, except to the extent required by
applicable law. If FIBK or GWB update one or more forward-looking statements, no inference should be drawn that FIBK or GWB will
make additional updates with respect to those or other forward-looking statements. Further information regarding FIBK, GWB and
factors which could affect the forward-looking statements contained herein can be found in the registration statement on Form S-4,
as well as FIBK&#8217;s Annual Report on Form 10-K for the fiscal year ended December 31, 2020, its Quarterly Reports on Form 10-Q
for the three-month periods ended March 31, 2021, June 30, 2021 and September 30, 2021, and its other filings with the SEC, and in
GWB&#8217;s Annual Report on Form 10-K for the fiscal year ended September 30, 2021, and its other filings with the SEC.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><b>Additional Information about the Transaction and Where to Find It
</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">This communication is being made with respect to the proposed
transaction involving FIBK and GWB. This material is not a solicitation of any vote or approval of GWB stockholders and is not a
substitute for the joint proxy statement/prospectus or any other documents that GWB may send to stockholders in connection with the
proposed merger. This communication does not constitute an offer to sell or the solicitation of an offer to buy any securities.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">In connection with the Transaction, FIBK has filed with the SEC a Registration
Statement on Form S-4 to register the shares of FIBK capital stock to be issued in connection with the Transaction. The Registration Statement
includes a joint proxy statement of FIBK and GWB that also constitutes a prospectus of FIBK. The registration statement on Form S-4 was
declared effective by the SEC on December 16, 2021, and FIBK and GWB commenced mailing the definitive joint proxy statement/prospectus
to their shareholders and stockholders, respectively, on or about December 16, 2021.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">INVESTORS AND SECURITY HOLDERS ARE URGED TO READ THE REGISTRATION STATEMENT
ON FORM S-4 AND THE JOINT PROXY STATEMENT/PROSPECTUS INCLUDED WITHIN THE REGISTRATION STATEMENT ON FORM S-4, AS WELL AS ANY OTHER RELEVANT
DOCUMENTS FILED WITH THE SEC IN CONNECTION WITH THE TRANSACTION OR INCORPORATED BY REFERENCE INTO THE JOINT PROXY STATEMENT/PROSPECTUS,
BECAUSE THEY CONTAIN IMPORTANT INFORMATION REGARDING FIBK, GWB, THE TRANSACTION AND RELATED MATTERS.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Investors and security holders may obtain free copies of these
documents and other documents filed with the SEC by FIBK or GWB through the website maintained by the SEC at http://www.sec.gov or
from FIBK at its website, www.fibk.com, or from GWB at its website, www.greatwesternbank.com. Documents filed with the SEC by FIBK
are available free of charge by accessing the &#8220;SEC Filings&#8221; page of FIBK&#8217;s website at www.fibk.com/sec-filings, or
alternatively by directing a request by mail or telephone to First Interstate BancSystem, Inc., 401 N. 31st Street, Billings,
Montana, 59116, Attention: John Stewart, Deputy Chief Financial Officer, telephone: 406-255-5311, and documents filed with the SEC
by GWB are available free of charge by accessing GWB&#8217;s website at www.greatwesternbank.com under the tab &#8220;Investor
Relations&#8221; and then under the heading &#8220;Financial Info &#8211; Documents&#8221; or, alternatively, by directing a request
by telephone or mail to Great Western Bancorp Inc., 225 South Main Avenue, Sioux Falls, South Dakota 57104, (605) 988-9253.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><b>Participants in the Solicitation</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">FIBK, GWB, and certain of their respective directors and
executive officers may be deemed to be participants in the solicitation of proxies from the shareholders of FIBK and stockholders of
GWB in connection with the Transaction under the rules of the SEC. Information about the interests of the directors and executive
officers of FIBK and GWB and other persons who may be deemed to be participants in the solicitation of shareholders of FIBK and
stockholders of GWB in connection with the Transaction and a description of their direct and indirect interests, by security
holdings or otherwise, is included in the joint proxy statement/prospectus related to the Transaction. Additional information about
FIBK, the directors and executive officers of FIBK and their ownership of FIBK common stock is also set forth in the definitive
proxy statement for FIBK&#8217;s 2021 Annual Meeting of Shareholders, as filed with the SEC on Schedule 14A on April 14, 2021, and
other documents subsequently filed by FIBK with the SEC. Additional information about GWB, the directors and executive officers of
GWB and their ownership of GWB common stock can also be found in GWB&#8217;s Annual Report on Form 10-K for the fiscal year ended
September 30, 2021, as filed with the SEC on November 24, 2021, and other documents subsequently filed by GWB with the SEC. Free
copies of these documents may be obtained as described above.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>


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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b>SIGNATURE</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%">
  <tr style="vertical-align: top">
    <td>&#160;</td>
    <td colspan="2"><span style="font-size: 10pt">FIRST INTERSTATE BANCSYSTEM,&#160;&#160;INC.</span></td></tr>
  <tr style="vertical-align: top">
    <td>&#160;</td>
    <td colspan="2">&#160;</td></tr>
  <tr style="vertical-align: top">
    <td>&#160;</td>
    <td colspan="2">&#160;</td></tr>
  <tr style="vertical-align: bottom">
    <td style="width: 50%"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></td>
    <td style="width: 5%"><span style="font: 10pt Times New Roman, Times, Serif">By: </span></td>
    <td style="border-bottom: black 1pt solid; width: 45%"><span style="font: 10pt Times New Roman, Times, Serif">/s/ Kevin P. Riley&#160;&#160;&#160;&#160;&#160;&#160;&#160;</span></td></tr>
  <tr style="vertical-align: bottom">
    <td>&#160;</td>
    <td><span style="font: 10pt Times New Roman, Times, Serif">Name:</span></td>
    <td><span style="font: 10pt Times New Roman, Times, Serif">Kevin P. Riley&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;</span></td></tr>
  <tr>
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    <td style="vertical-align: top"><span style="font: 10pt Times New Roman, Times, Serif">Title:</span></td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Date: December 22, 2021</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>


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<P STYLE="margin: 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="text-align: right; margin: 0"><FONT STYLE="font-family: Arial, Helvetica, Sans-Serif; font-size: 10pt"><B>Exhibit 99.1&nbsp;</B></FONT></P>

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<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; color: Red; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0pt 0; color: Red"></P>

<P STYLE="margin: 0pt 0; font: 10pt Arial, Helvetica, Sans-Serif; color: Red"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0pt 0; color: Red"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">WLRK COMMENTS 12/22</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">Thursday, December 22, 2021</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-size: 10pt"><B>First Interstate
BancSystem Receives Regulatory Approvals from the Federal Reserve System and Montana Division of Banking</B></FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-size: 10pt"><B>for Great Western
Bancorp Merger</B></FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">BILLINGS, MT and Sioux Falls, SD&mdash;Dec.
22, 2021&mdash; First Interstate BancSystem, Inc. (NASDAQ: FIBK) (&ldquo;FIBK&rdquo;), parent company of First Interstate Bank, and Great
Western Bancorp, Inc. (NYSE: GWB) (&ldquo;GWB&rdquo;), parent company of Great Western Bank, today jointly announced that they have received
the required regulatory clearances from the Board of Governors of the Federal Reserve System and the Montana Division of Banking and
Financial Institutions related to the proposed merger of FIBK and GWB and the merger of FIBK&rsquo;s and GWB&rsquo;s respective subsidiary
banks, First Interstate Bank and Great Western Bank.</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">The merger of GWB into FIBK and the transaction
is expected to close in February 2022, subject to other customary closing conditions set forth in the merger agreement between FIBK and
GWB, including regulatory approval from the Division of Banking of the South Dakota Department of Labor and Regulation and receipt of
the requisite approvals of the shareholders of FIBK and stockholders of GWB at their upcoming special meetings on January 19, 2022. The
combined holding company will operate under the First Interstate name and brand with the company&rsquo;s headquarters remaining in Billings,
Montana.</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">The combined company leverages the strengths
of both organizations, creating a diversified, community-focused banking franchise with a network of more than 300 branches across 14
states. With assets totaling over $32 billion, the pro forma company establishes FIBK as the premier banking franchise in the West.</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt; background-color: white">&quot;We are
pleased to have received regulatory approval from the Federal Reserve and from the State of Montana of our partnership with Great Western
Bank,&quot; said&nbsp;Kevin Riley, FIBK President and CEO. &quot;</FONT><FONT STYLE="font-size: 10pt">We are eager to expand First Interstate&rsquo;s
community banking model into eight new states and look forward to building relationships with the employees and clients who call these
beautiful regions home.&rdquo;</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt; background-color: white">After closing,
FIBK will provide GWB customers comprehensive information relating to the anticipated conversion of their accounts in&nbsp;May 2022,
at which time </FONT><FONT STYLE="font-size: 10pt">GWB branches will become FIBK branches. Until then, <FONT STYLE="background-color: white">clients
will continue to be served through their respective GWB&nbsp;and FIBK branches, websites, and mobile apps. </FONT></FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt; background-color: white">&ldquo;We&rsquo;re
excited to join forces, and confident that both companies&rsquo; stakeholders will benefit from this partnership,&rdquo; said Mark Borrecco,
GWB President and CEO. &ldquo;We&rsquo;ll be able to offer customers access to additional branch locations and new products and services,
provide new growth and professional development opportunities to our employees, deliver additional returns to our shareholders, and have
an even greater impact on our communities.&rdquo; </FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>


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<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0pt 3pt"><FONT STYLE="font-size: 10pt; background-color: white"><B>About First
Interstate BancSystem, Inc.</B></FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt; background-color: white">First Interstate
BancSystem, Inc. is a financial services holding company headquartered in Billings, Montana. It is the parent company of First Interstate
Bank, a community bank with $19.3 billion in assets as of September 30, 2021. First Interstate proudly delivers financial solutions across
Idaho, Montana, Oregon, South Dakota, Washington, and Wyoming. A recognized leader in community banking services, First Interstate is
driven by strong values as well as a commitment to delivering a rewarding experience to its employees, strong returns to shareholders,
exceptional products and services to its clients, and resources to the communities it serves. More information is available at&nbsp;<FONT STYLE="color: black">www.firstinterstate.com</FONT>.</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0pt 3pt"><FONT STYLE="font-size: 10pt"><B>About Great Western Bancorp, Inc.</B></FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">Great Western Bancorp, Inc. is the holding
company for Great Western Bank, a full-service, $13 billion regional bank focused on relationship-based business banking. Great Western
Bank offers small and mid-sized businesses a focused suite of financial products and a range of deposit and loan products to retail customers
through several channels, including the branch network, online banking system, mobile banking applications and customer care centers.
The bank services its customers through more than 170 branches in nine states: Arizona, Colorado, Iowa, Kansas, Minnesota, Missouri,
Nebraska, North Dakota, and South Dakota. To learn more about Great Western Bank, visit&nbsp;<FONT STYLE="color: black; background-color: white">www.greatwesternbank.com</FONT>.</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0pt 3pt"><FONT STYLE="font-size: 10pt"><B>Cautionary Note Regarding Forward
Looking Statements </B></FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">This communication contains &ldquo;forward-looking
statements&rdquo; within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and
Section 21E of the Securities Exchange Act of 1934, as amended, and Rule 3b-6 promulgated thereunder, which involve inherent risks and
uncertainties. Any statements about FIBK&rsquo;s, GWB&rsquo;s or the combined company&rsquo;s plans, objectives, expectations, strategies,
beliefs, or future performance or events constitute forward-looking statements. Such statements are identified as those that include
words or phrases such as &ldquo;believes,&rdquo; &ldquo;expects,&rdquo; &ldquo;anticipates,&rdquo; &ldquo;plans,&rdquo; &ldquo;trend,&rdquo;
&ldquo;objective,&rdquo; &ldquo;continue,&rdquo; or similar expressions or future or conditional verbs such as &ldquo;will,&rdquo; &ldquo;would,&rdquo;
&ldquo;should,&rdquo; &ldquo;could,&rdquo; &ldquo;might,&rdquo; &ldquo;may,&rdquo; or similar expressions. Forward-looking statements
involve known and unknown risks, uncertainties, assumptions, estimates, and other important factors that change over time and could cause
actual results to differ materially from any results, performance, or events expressed or implied by such forward-looking statements.
Such forward-looking statements include but are not limited to statements about the benefits of the business combination transaction
between FIBK and GWB (the &ldquo;Transaction&rdquo;), including future financial and operating results, the combined company&rsquo;s
plans, objectives, expectations and intentions, and other statements that are not historical facts.<BR>
<BR></FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">These forward-looking statements are
subject to risks and uncertainties that may cause actual results to differ materially from those projected. In addition to factors previously
disclosed in FIBK&rsquo;s and GWB&rsquo;s reports filed with the U.S. Securities and Exchange Commission (the &ldquo;SEC&rdquo;) and
those identified elsewhere in this document, the following factors, among others, could cause actual results to differ materially from
forward-looking statements or historical performance: the occurrence of any event, change, or other circumstance that could give rise
to the right of one or both of the parties to terminate the definitive merger agreement between FIBK and GWB; the outcome of any legal
proceedings that may be instituted against FIBK or GWB; the possibility that the Transaction does not close when expected or at all because
required regulatory, shareholder or other approvals and other</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>


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<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">conditions to closing are not received
or satisfied on a timely basis or at all (and the risk that such approvals may result in the imposition of conditions that could adversely
affect the combined company or the expected benefits of the Transaction); the risk that the benefits from the Transaction may not be
fully realized or may take longer to realize than expected, including as a result of changes in, or problems arising from, general economic
and market conditions, interest and exchange rates, monetary policy, laws and regulations and their enforcement, and the degree of competition
in the geographic and business areas in which FIBK and GWB operate; the ability to promptly and effectively integrate the businesses
of FIBK and GWB; the possibility that the Transaction may be more expensive to complete than anticipated, including as a result of unexpected
factors or events; reputational risk and potential adverse reactions of FIBK&rsquo;s or GWB&rsquo;s customers, employees or other business
partners, including those resulting from the announcement or completion of the Transaction; the dilution caused by FIBK&rsquo;s issuance
of additional shares of its capital stock in connection with the Transaction; the diversion of management&rsquo;s attention and time
from ongoing business operations and opportunities on merger-related matters; and the impact of the global COVID-19 pandemic on FIBK&rsquo;s
or GWB&rsquo;s businesses, the ability to complete the Transaction or any of the other foregoing risks.<BR>
<BR></FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">These factors are not necessarily all
of the factors that could cause FIBK&rsquo;s, GWB&rsquo;s or the combined company&rsquo;s actual results, performance, or achievements
to differ materially from those expressed in or implied by any of the forward-looking statements. Other unknown or unpredictable factors
also could harm FIBK&rsquo;s, GWB&rsquo;s or the combined company&rsquo;s results.</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">All forward-looking statements attributable
to FIBK, GWB, or the combined company, or persons acting on FIBK&rsquo;s or GWB&rsquo;s behalf, are expressly qualified in their entirety
by the cautionary statements set forth above. Forward-looking statements speak only as of the date they are made and FIBK and GWB do
not undertake or assume any obligation to update publicly any of these statements to reflect actual results, new information or future
events, changes in assumptions, or changes in other factors affecting forward-looking statements, except to the extent required by applicable
law. If FIBK or GWB update one or more forward-looking statements, no inference should be drawn that FIBK or GWB will make additional
updates with respect to those or other forward-looking statements. Further information regarding FIBK, GWB and factors which could affect
the forward-looking statements contained herein can be found in the registration statement on Form S-4, as well as FIBK&rsquo;s Annual
Report on Form 10-K for the fiscal year ended December 31, 2020, its Quarterly Reports on Form 10-Q for the three-month periods ended
March 31, 2021, June 30, 2021 and September 30, 2021, and its other filings with the SEC, and in GWB&rsquo;s Annual Report on Form 10-K
for the fiscal year ended September 30, 2021, and its other filings with the SEC.</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt"><B>Additional Information about the Transaction
and Where to Find It </B></FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">This communication is being made with
respect to the proposed transaction involving FIBK and GWB. This material is not a solicitation of any vote or approval of GWB stockholders
and is not a substitute for the joint proxy statement/prospectus or any other documents that GWB may send to stockholders in connection
with the proposed merger. This communication does not constitute an offer to sell or the solicitation of an offer to buy any securities.</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">In connection with the Transaction, FIBK
has filed with the SEC a Registration Statement on Form S-4 to register the shares of FIBK capital stock to be issued in connection with
the Transaction. The Registration Statement includes a joint proxy statement of FIBK and GWB that also constitutes a prospectus of FIBK.
The registration statement on Form S-4 was declared effective by the SEC on December 16, 2021, and FIBK and GWB commenced mailing</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>


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<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">the definitive joint proxy statement/prospectus
to their shareholders and stockholders, respectively, on or about December 16, 2021.<BR></FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">INVESTORS AND SECURITY HOLDERS ARE URGED
TO READ THE REGISTRATION STATEMENT ON FORM S-4 AND THE JOINT PROXY STATEMENT/PROSPECTUS INCLUDED WITHIN THE REGISTRATION STATEMENT ON
FORM S-4, AS WELL AS ANY OTHER RELEVANT DOCUMENTS FILED WITH THE SEC IN CONNECTION WITH THE TRANSACTION OR INCORPORATED BY REFERENCE
INTO THE JOINT PROXY STATEMENT/PROSPECTUS, BECAUSE THEY CONTAIN IMPORTANT INFORMATION REGARDING FIBK, GWB, THE TRANSACTION AND RELATED
MATTERS.<BR>
<BR></FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">Investors and security holders may obtain
free copies of these documents and other documents filed with the SEC by FIBK or GWB through the website maintained by the SEC at http://www.sec.gov
or from FIBK at its website, www.fibk.com, or from GWB at its website, www.greatwesternbank.com. Documents filed with the SEC by FIBK
are available free of charge by accessing the &ldquo;SEC Filings&rdquo; page of FIBK&rsquo;s website at www.fibk.com/sec-filings, or
alternatively by directing a request by mail or telephone to First Interstate BancSystem, Inc., 401 N. 31st Street, Billings, Montana,
59116, Attention: John Stewart, Deputy Chief Financial Officer, telephone: 406-255-5311, and documents filed with the SEC by GWB are
available free of charge by accessing GWB&rsquo;s website at www.greatwesternbank.com under the tab &ldquo;Investor Relations&rdquo;
and then under the heading &ldquo;Financial Info &ndash; Documents&rdquo; or, alternatively, by directing a request by telephone or mail
to Great Western Bancorp Inc., 225 South Main Avenue, Sioux Falls, South Dakota 57104, (605) 988-9253.<BR>
<BR></FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0pt 3pt"><FONT STYLE="font-size: 10pt"><B>Participants in the Solicitation</B></FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">FIBK, GWB, and certain of their respective
directors and executive officers may be deemed to be participants in the solicitation of proxies from the shareholders of FIBK and stockholders
of GWB in connection with the Transaction under the rules of the SEC. Information about the interests of the directors and executive
officers of FIBK and GWB and other persons who may be deemed to be participants in the solicitation of shareholders of FIBK and stockholders
of GWB in connection with the Transaction and a description of their direct and indirect interests, by security holdings or otherwise,
is included in the joint proxy statement/prospectus related to the Transaction. Additional information about FIBK, the directors and
executive officers of FIBK and their ownership of FIBK common stock is also set forth in the definitive proxy statement for FIBK&rsquo;s
2021 Annual Meeting of Shareholders, as filed with the SEC on Schedule 14A on April 14, 2021, and other documents subsequently filed
by FIBK with the SEC. Additional information about GWB, the directors and executive officers of GWB and their ownership of GWB common
stock can also be found in GWB&rsquo;s Annual Report on Form 10-K for the fiscal year ended September 30, 2021, as filed with the SEC
on November 24, 2021, and other documents subsequently filed by GWB with the SEC. Free copies of these documents may be obtained as described
above.</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt"><B>Contacts</B></FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0pt 3pt"><FONT STYLE="font-size: 10pt"><B>Media: </B></FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">Brittany Cremer</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">PR &amp; Communications Manager</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">406-255-5310</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">brittany.cremer@fib.com</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>


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<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0pt 3pt"><FONT STYLE="font-size: 10pt"><B>Investors: </B><BR>
John R. Stewart, CFA</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">Deputy Chief Financial Officer</FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">406-255-5311<BR>
<FONT STYLE="color: black">john.stewart@fib.com</FONT></FONT></P>

<P STYLE="font: 11pt Arial, Helvetica, Sans-Serif; margin: 0pt 0"><FONT STYLE="font-size: 10pt">&nbsp;</FONT></P>

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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentAnnualReport" xlink:to="dei_DocumentAnnualReport_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentAnnualReport_lbl" xml:lang="en-US">Document Annual Report</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentQuarterlyReport" xlink:label="dei_DocumentQuarterlyReport" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentQuarterlyReport_lbl" xml:lang="en-US">Document Quarterly Report</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentTransitionReport_lbl" xml:lang="en-US">Document Transition Report</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentShellCompanyReport" xlink:label="dei_DocumentShellCompanyReport" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentShellCompanyEventDate" xlink:to="dei_DocumentShellCompanyEventDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentShellCompanyEventDate_lbl" xml:lang="en-US">Document Shell Company Event Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentPeriodStartDate" xlink:label="dei_DocumentPeriodStartDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentPeriodStartDate" xlink:to="dei_DocumentPeriodStartDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentPeriodStartDate_lbl" xml:lang="en-US">Document Period Start Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentPeriodEndDate" xlink:label="dei_DocumentPeriodEndDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentPeriodEndDate" xlink:to="dei_DocumentPeriodEndDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentPeriodEndDate_lbl" xml:lang="en-US">Document Period End Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_DocumentFiscalPeriodFocus" xlink:label="dei_DocumentFiscalPeriodFocus" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentFiscalPeriodFocus" xlink:to="dei_DocumentFiscalPeriodFocus_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xml:lang="en-US">Document Fiscal Period Focus</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentFiscalYearFocus" xlink:to="dei_DocumentFiscalYearFocus_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentFiscalYearFocus_lbl" xml:lang="en-US">Document Fiscal Year Focus</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_CurrentFiscalYearEndDate" xlink:label="dei_CurrentFiscalYearEndDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CurrentFiscalYearEndDate" xlink:to="dei_CurrentFiscalYearEndDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xml:lang="en-US">Current Fiscal Year End Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityFileNumber" xlink:label="dei_EntityFileNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityFileNumber" xlink:to="dei_EntityFileNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityFileNumber_lbl" xml:lang="en-US">Entity File Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityRegistrantName" xlink:label="dei_EntityRegistrantName" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityRegistrantName" xlink:to="dei_EntityRegistrantName_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityRegistrantName_lbl" xml:lang="en-US">Entity Registrant Name</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityCentralIndexKey" xlink:label="dei_EntityCentralIndexKey" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityCentralIndexKey" xlink:to="dei_EntityCentralIndexKey_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityCentralIndexKey_lbl" xml:lang="en-US">Entity Central Index Key</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityPrimarySicNumber" xlink:label="dei_EntityPrimarySicNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityPrimarySicNumber" xlink:to="dei_EntityPrimarySicNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityPrimarySicNumber_lbl" xml:lang="en-US">Entity Primary SIC Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityTaxIdentificationNumber" xlink:label="dei_EntityTaxIdentificationNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityTaxIdentificationNumber" xlink:to="dei_EntityTaxIdentificationNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityTaxIdentificationNumber_lbl" xml:lang="en-US">Entity Tax Identification Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityIncorporationStateCountryCode" xlink:label="dei_EntityIncorporationStateCountryCode" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityIncorporationStateCountryCode" xlink:to="dei_EntityIncorporationStateCountryCode_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityIncorporationStateCountryCode_lbl" xml:lang="en-US">Entity Incorporation, State or Country Code</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressAddressLine1" xlink:label="dei_EntityAddressAddressLine1" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressAddressLine1_lbl" xml:lang="en-US">Entity Address, Address Line One</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressAddressLine2_lbl" xml:lang="en-US">Entity Address, Address Line Two</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressAddressLine3_lbl" xml:lang="en-US">Entity Address, Address Line Three</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressCityOrTown_lbl" xml:lang="en-US">Entity Address, City or Town</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressStateOrProvince_lbl" xml:lang="en-US">Entity Address, State or Province</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressCountry_lbl" xml:lang="en-US">Entity Address, Country</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_EntityAddressPostalZipCode" xlink:label="dei_EntityAddressPostalZipCode" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CountryRegion_lbl" xml:lang="en-US">Country Region</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_Extension_lbl" xml:lang="en-US">Extension</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_WrittenCommunications" xlink:to="dei_WrittenCommunications_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_WrittenCommunications_lbl" xml:lang="en-US">Written Communications</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_SolicitingMaterial" xlink:label="dei_SolicitingMaterial" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_SolicitingMaterial" xlink:to="dei_SolicitingMaterial_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_SolicitingMaterial_lbl" xml:lang="en-US">Soliciting Material</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_PreCommencementTenderOffer" xlink:to="dei_PreCommencementTenderOffer_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_PreCommencementTenderOffer_lbl" xml:lang="en-US">Pre-commencement Tender Offer</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_PreCommencementIssuerTenderOffer" xlink:label="dei_PreCommencementIssuerTenderOffer" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_PreCommencementIssuerTenderOffer" xlink:to="dei_PreCommencementIssuerTenderOffer_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_PreCommencementIssuerTenderOffer_lbl" xml:lang="en-US">Pre-commencement Issuer Tender Offer</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_Security12bTitle" xlink:label="dei_Security12bTitle" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_Security12bTitle" xlink:to="dei_Security12bTitle_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_Security12bTitle_lbl" xml:lang="en-US">Title of 12(b) Security</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_NoTradingSymbolFlag_lbl" xml:lang="en-US">No Trading Symbol Flag</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_TradingSymbol_lbl" xml:lang="en-US">Trading Symbol</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2021/dei-2021.xsd#dei_SecurityExchangeName" xlink:label="dei_SecurityExchangeName" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_SecurityExchangeName_lbl" xml:lang="en-US">Security Exchange Name</link:label>
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</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.PRE
<SEQUENCE>5
<FILENAME>fibk-20211222_pre.xml
<DESCRIPTION>XBRL PRESENTATION FILE
<TEXT>
<XBRL>
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<SEQUENCE>8
<FILENAME>R1.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
							function toggleNextSibling (e) {
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<body>
<span style="display: none;">v3.21.4</span><table class="report" border="0" cellspacing="2" id="idm140676971470200">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Cover<br></strong></div></th>
<th class="th"><div>Dec. 22, 2021</div></th>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_CoverAbstract', window );"><strong>Cover [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentType', window );">Document Type</a></td>
<td class="text">8-K<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_AmendmentFlag', window );">Amendment Flag</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_DocumentPeriodEndDate', window );">Document Period End Date</a></td>
<td class="text">Dec. 22,  2021<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityFileNumber', window );">Entity File Number</a></td>
<td class="text">001-34653<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityRegistrantName', window );">Entity Registrant Name</a></td>
<td class="text">FIRST INTERSTATE BANCSYSTEM, INC.<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityCentralIndexKey', window );">Entity Central Index Key</a></td>
<td class="text">0000860413<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityTaxIdentificationNumber', window );">Entity Tax Identification Number</a></td>
<td class="text">81-0331430<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityIncorporationStateCountryCode', window );">Entity Incorporation, State or Country Code</a></td>
<td class="text">MT<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressAddressLine1', window );">Entity Address, Address Line One</a></td>
<td class="text">401 North 31st Street<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressCityOrTown', window );">Entity Address, City or Town</a></td>
<td class="text">Billings<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressStateOrProvince', window );">Entity Address, State or Province</a></td>
<td class="text">MT<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityAddressPostalZipCode', window );">Entity Address, Postal Zip Code</a></td>
<td class="text">59116-0918<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_CityAreaCode', window );">City Area Code</a></td>
<td class="text">406<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_LocalPhoneNumber', window );">Local Phone Number</a></td>
<td class="text">255-5390<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_WrittenCommunications', window );">Written Communications</a></td>
<td class="text">true<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_SolicitingMaterial', window );">Soliciting Material</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_PreCommencementTenderOffer', window );">Pre-commencement Tender Offer</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_PreCommencementIssuerTenderOffer', window );">Pre-commencement Issuer Tender Offer</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">Class A common stock, no par value<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">FIBK<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NASDAQ<span></span>
</td>
</tr>
<tr class="re">
<td class="pl " style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="top.Show.showAR( this, 'defref_dei_EntityEmergingGrowthCompany', window );">Entity Emerging Growth Company</a></td>
<td class="text">false<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_AmendmentFlag">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_AmendmentFlag</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_CityAreaCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Area code of city</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_CityAreaCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_CoverAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Cover page.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_CoverAbstract</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentPeriodEndDate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period.  The format of the date is YYYY-MM-DD.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentPeriodEndDate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:dateItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentType">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentType</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:submissionTypeItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressAddressLine1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Address Line 1 such as Attn, Building Name, Street Name</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressAddressLine1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressCityOrTown">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the City or Town</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressCityOrTown</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressPostalZipCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Code for the postal or zip code</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressPostalZipCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the state or province.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressStateOrProvince</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Balance Type:</strong></td>
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<td><strong> Period Type:</strong></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityCentralIndexKey">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityCentralIndexKey</td>
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<tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityEmergingGrowthCompany">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Indicate if registrant meets the emerging growth company criteria.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityEmergingGrowthCompany</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityFileNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityFileNumber</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
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</table></div>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityIncorporationStateCountryCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Two-character EDGAR code representing the state or country of incorporation.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityIncorporationStateCountryCode</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>dei:edgarStateCountryItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
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</table></div>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityRegistrantName">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityRegistrantName</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityTaxIdentificationNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Regulation 12B<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityTaxIdentificationNumber</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
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<td><strong> Data Type:</strong></td>
<td>dei:employerIdItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td><strong> Period Type:</strong></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_LocalPhoneNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Local phone number for entity.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_LocalPhoneNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_PreCommencementIssuerTenderOffer">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 13e<br> -Subsection 4c<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_PreCommencementIssuerTenderOffer</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_PreCommencementTenderOffer">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 14d<br> -Subsection 2b<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_PreCommencementTenderOffer</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_Security12bTitle">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Title of a 12(b) registered security.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_Security12bTitle</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>dei:securityTitleItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_SecurityExchangeName">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Name of the Exchange on which a security is registered.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection d1-1<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_SecurityExchangeName</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:edgarExchangeCodeItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_SolicitingMaterial">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Section 14a<br> -Number 240<br> -Subsection 12<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_SolicitingMaterial</td>
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<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_TradingSymbol">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Trading symbol of an instrument as listed on an exchange.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_TradingSymbol</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
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<td><strong> Balance Type:</strong></td>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_WrittenCommunications">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="top.Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.</p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Securities Act<br> -Number 230<br> -Section 425<br></p></div>
<a href="javascript:void(0);" onclick="top.Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_WrittenCommunications</td>
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<td>dei_</td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
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end
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
