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First Interstate Bank, History
The following are major historical events for First Interstate Bank, including mergers and acquisitions.
| 1916-10-09 | Institution established: Original name:Security Trust and Savings Bank | |
| 1974-08-01 | Changed name to Security Bank, N. A. | |
| 1984-07-01 | Changed name to First Interstate Bank of Billings, National Association | |
| 1992-12-01 | Changed name to The First Interstate Bank of Commerce | |
| 1992-12-01 | Acquired First Interstate Bank of South Missoula, National Association (33742) in MISSOULA, MT | |
| 1992-12-01 | Acquired First Interstate Bank of Missoula, National Association (2195) in MISSOULA, MT | |
| 1992-12-01 | Acquired First Interstate Bank of Hardin (16227) in HARDIN, MT | |
| 1992-12-01 | Acquired First Interstate Bank of Miles City (21695) in MILES CITY, MT | |
| 1992-12-01 | Acquired First Interstate Bank of Colstrip (22019) in COLSTRIP, MT | |
| 1992-12-01 | Acquired First Interstate Bank of Billings Heights (23023) in BILLINGS, MT | |
| 1992-12-01 | Acquired First Interstate Bank of West Billings (22415) in BILLINGS, MT | |
| 1995-05-05 | Acquired First Citizens Bank of Bozeman (23372) in BOZEMAN, MT | |
| 1995-09-23 | Acquired The First National Park Bank in Livingston (2193) in LIVINGSTON, MT | |
| 1997-06-21 | Acquired Mountain Bank (19279) in WHITEFISH, MT | |
| 1997-06-21 | Changed name to First Interstate Bank | |
| 1997-06-21 | Acquired First Interstate Bank of Montana, National Association (2189) in KALISPELL, MT | |
| 1997-12-23 | Acquired First Interstate Bank, FSB (34260) in HAMILTON, MT | |
| 1999-09-01 | Acquired Security State Bank and Trust Company (362) in POLSON, MT | |
| 2001-11-10 | Acquired First Interstate Bank (524) in SHERIDAN, WY | |
| 2003-01-27 | Acquired The United States National Bank of Red Lodge (2200) in RED LODGE, MT | |
| 2009-09-26 | Acquired First Western Bank (488) in WALL, SD | |
| 2009-09-26 | Acquired The First Western Bank Sturgis (26773) in STURGIS, SD | |
| 2014-10-18 | Acquired Mountain West Bank, National Association (33314) in HELENA, MT | |
| 2015-07-25 | Acquired United Bank (18772) in ABSAROKEE, MT | |
| 2016-08-13 | Acquired Flathead Bank of Bigfork, Montana (20382) in BIGFORK, MT | |
| 2017-08-12 | Acquired Bank of the Cascades (22407) in BEND, OR | |
| 2018-11-10 | Acquired Inland Northwest Bank (27601) in SPOKANE, WA | |
| 2019-04-08 | Acquired Idaho Independent Bank (33845) in COEUR D ALENE, ID | |
| 2019-04-08 | Acquired Community 1st Bank (58576) in POST FALLS, ID |