Exhibit A

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k) of the Securities Exchange Act of 1934, as amended, the undersigned agree to the joint filing on behalf of each of them of a Statement on Schedule 13G (including any and all amendments thereto) with respect to the Class A Common Stock of First Interstate BancSystem, Inc. and further agree that this Joint Filing Agreement shall be included as an Exhibit to such joint filing. This Agreement may be executed in any number of counterparts, all of which taken together shall constitute one and the same instrument. In evidence thereof, the undersigned, being duly authorized, hereby execute this Joint Filing Agreement as of June 7, 2017.

LIGHTYEAR FUND II, L.P. By:   Lightyear Fund II GP, L.P., its general partner By:   Lightyear Fund II GP Holdings, LLC, its general partner
By:	/s/ Ellan Ben-Hayon
Name:	Ellan Ben-Hayon
Title:	Vice President

LIGHTYEAR CO-INVEST PARTNERSHIP II, L.P. By:   Lightyear Fund II GP Holdings, LLC, its general partner
By:	/s/ Ellan Ben-Hayon
Name:	Ellan Ben-Hayon
Title:	Vice President

LIGHTYEAR FUND II GP, L.P. By:   Lightyear Fund II GP Holdings, LLC, its general partner
By:	/s/ Ellan Ben-Hayon
Name:	Ellan Ben-Hayon
Title:	Vice President

LIGHTYEAR FUND II GP HOLDINGS, LLC
By:	/s/ Ellan Ben-Hayon
Name:	Ellan Ben-Hayon
Title:	Vice President

LY HOLDINGS, LLC
By:	/s/ Ellan Ben-Hayon
Name:	Ellan Ben-Hayon
Title:	Vice President

MARK F. VASSALLO, an individual
By:	/s/ Ellan Ben-Hayon
Name:	Ellan Ben-Hayon
Title:	Attorney-in-Fact