AMENDED AND RESTATED JOINT FILING AGREEMENT PURSUANT TO RULE 13d-1(k)(1)

Exhibit 99.1

AMENDED AND RESTATED JOINT FILING AGREEMENT

PURSUANT TO RULE 13d-1(k)(1)

This Amended and Restated Joint Filing Agreement (this “Agreement”) is made pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), by and among the parties listed below, each referred to herein as a “Joint Filer.” Each Joint Filer agrees that a statement of beneficial ownership as required by Section 13(d) of the Exchange Act and the rules thereunder may be filed on each of their behalf on Schedule 13D or Schedule 13G, as appropriate, with respect to his, her or its ownership of the Class A Common Stock and Class B Common Stock of First Interstate BancSystem, Inc., and that said joint filing may thereafter be amended by further joint filings. Each Joint Filer states that he, she or it satisfied the requirements for making a joint filing under Rule 13d-1. This Agreement may be executed in any number of counterparts, all of which taken together shall constitute one and the same instrument.

IN WITNESS WHEREOF, each of the undersigned hereby execute and deliver this Agreement as of this 1st day of July, 2020.

JOINT FILERS

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Xxxxx X. Xxxxx, Xx.

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Xxxxxx Xxxxx

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Xxxxxxxx X. Xxxxx

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Xxxx X. Xxxxx

N Bar 5, Limited Partnership

By:

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Name:

Xxxx X. Xxxxx

Title:

Managing General Partner

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Xxxxx X. Xxxxx

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Xxxx X. Xxxxxxxx, Xx.

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Xxxxx Xxxxx Xxxx

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Xxxxx X. Xxxxx, Xx.

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Xxxxx X. Xxxxxxxx

*By:

/s/ XXXXXXX XXXXXXXX

Xxxxxxx Xxxxxxxx, as attorney-in-fact