Bank Branches › Banks › First Interstate Bank
First Interstate Bank
274 offices in 10 states as of June 30, 2026, down from 311 in 2022. $21.7 billion in deposits. Main office: 401 N 31st St, Billings, MT. FDIC certificate 1105.
274
offices
10
states
−7
gone since 2025
+1
new since 2025
Where its offices are
Offices over time
Bank offices reporting on June 30Deposits booked at them (nominal dollars, own scale)
| Date | offices | Change | Deposits |
|---|---|---|---|
| Jun 30 1994 | 11 | $620M | |
| Jun 30 1995 | 14 | +3 | $694M |
| Jun 30 2000 | 35 | +5 | $1.3B |
| Jun 30 2005 | 63 | −1 | $3.3B |
| Jun 30 2010 | 76 | +19 | $5.8B |
| Jun 30 2015 | 81 | +5 | $6.8B |
| Jun 30 2020 | 153 | −1 | $13.3B |
| Jun 30 2022PEAK | 311 | +162 | $26.9B |
| Jun 30 2025 | 302 | −3 | $23.0B |
| Jun 30 2026NOW | 274 | −28 | $21.7B |
Open the full passbook — all 33 years ▾
| Date | offices | Change | Deposits |
|---|---|---|---|
| Jun 30 1994 | 11 | $620M | |
| Jun 30 1995 | 14 | +3 | $694M |
| Jun 30 1996 | 16 | +2 | $774M |
| Jun 30 1997 | 21 | +5 | $1.1B |
| Jun 30 1998 | 28 | +7 | $1.2B |
| Jun 30 1999 | 30 | +2 | $1.3B |
| Jun 30 2000 | 35 | +5 | $1.3B |
| Jun 30 2001 | 40 | +5 | $1.5B |
| Jun 30 2002 | 62 | +22 | $2.7B |
| Jun 30 2003 | 64 | +2 | $3.0B |
| Jun 30 2004 | 64 | · | $3.2B |
| Jun 30 2005 | 63 | −1 | $3.3B |
| Jun 30 2006 | 54 | −9 | $3.5B |
| Jun 30 2007 | 55 | +1 | $4.0B |
| Jun 30 2008 | 56 | +1 | $4.1B |
| Jun 30 2009 | 57 | +1 | $4.7B |
| Jun 30 2010 | 76 | +19 | $5.8B |
| Jun 30 2011 | 76 | · | $5.8B |
| Jun 30 2012 | 77 | +1 | $5.9B |
| Jun 30 2013 | 77 | · | $5.9B |
| Jun 30 2014 | 76 | −1 | $6.2B |
| Jun 30 2015 | 81 | +5 | $6.8B |
| Jun 30 2016 | 78 | −3 | $7.0B |
| Jun 30 2017 | 81 | +3 | $7.3B |
| Jun 30 2018 | 129 | +48 | $9.9B |
| Jun 30 2019 | 154 | +25 | $11.5B |
| Jun 30 2020 | 153 | −1 | $13.3B |
| Jun 30 2021 | 149 | −4 | $15.6B |
| Jun 30 2022PEAK | 311 | +162 | $26.9B |
| Jun 30 2023 | 308 | −3 | $23.8B |
| Jun 30 2024 | 305 | −3 | $23.1B |
| Jun 30 2025 | 302 | −3 | $23.0B |
| Jun 30 2026NOW | 274 | −28 | $21.7B |
Counted under FDIC certificate 1105. When one bank buys another, the bought bank's offices move onto the buyer's certificate, so a jump here is usually a merger, not a building spree. Its earlier names and the banks folded into it →
Offices with the most deposits booked
| Office | Deposits |
|---|---|
| First Interstate BankBillings, MT | $1.1B |
| Missoula Downtown BranchMissoula, MT | $600M |
| Sioux Falls Downtown BranchSioux Falls, SD | $486M |
| Bend Downtown BranchBend, OR | $389M |
| Casper Downtown BranchCasper, WY | $358M |
| Jackson Main BranchJackson, WY | $350M |
| Riverton BranchRiverton, WY | $344M |
| Great Falls 10Th Ave S BranchGreat Falls, MT | $331M |
| Rapid City Gateway BranchRapid City, SD | $327M |
| Clive University Ave. BranchClive, IA | $324M |
By state
| State | Offices |
|---|---|
| South Dakota | 46 |
| Iowa | 45 |
| Montana | 44 |
| Oregon | 33 |
| Nebraska | 29 |
| Idaho | 20 |
| Colorado | 19 |
| Washington | 17 |
| Wyoming | 15 |
| Missouri | 6 |