First Interstate Bank
Billings, MT · Owner: First Interstate BancSystem, Inc.
$25.8B
total assets, June 30, 2026
$25.8B
total assets, June 30, 2026
First Interstate Bank is a state member bank based in Billings, MT, owned by First Interstate BancSystem, Inc. (FIBK). As of June 30, 2026 it held $25.8 billion in assets and $21.7 billion in deposits; assets were down 6.2% from a year before. It has 274 branches in 10 states.
Updated Oct 11, 2026 · numbers as of June 30, 2026
Total assets
$25.8B
-6.2% in a year · -2.1% in a quarter
Deposits
$21.7B
-5.6% in a year · -2.1% in a quarter
Loans
$14.3B
-14.4% in a year · -3.5% in a quarter
Profit so far
$158M
Jan 1 to Jun 30, 2026 · +16.1% in a year
Capital ratio
9.42%
+0.12 pts in a year
Return on assets
1.21%
+0.24 pts in a year
Facts
- Type
- State member bank
- Head office
- 401 N 31st St, Billings, MT, 59101
- County
- Yellowstone
- Holding company
- First Interstate BancSystem, Inc. (FIBK)
- Established
- Oct 9, 1916
- Employees
- 3,016
- Branches
- 274 in 10 states
- Website
- www.firstinterstatebank.com
- Id
- b1105
Quarter by quarter
March 31, 1984 to June 30, 2026
Assets, deposits and loans
Each quarter end, US dollars
Profit by quarter
Net income of each quarter, the last 12
Ratios
Percent. Return on assets and net interest margin are yearly rates.
Branches
274 offices as of June 30, 2026, holding $21.7 billion in deposits
Branch map
Every branch, sized by its deposits
| State | Branches | Deposits | Share |
|---|---|---|---|
| Montana | 44 | $6.1B | 28.0% |
| South Dakota | 46 | $3.4B | 15.8% |
| Wyoming | 15 | $2.8B | 12.8% |
| Oregon | 33 | $2.4B | 11.2% |
| Iowa | 45 | $2.0B | 9.1% |
| Nebraska | 29 | $1.7B | 7.8% |
| Idaho | 20 | $1.7B | 7.8% |
| Colorado | 19 | $808M | 3.7% |
| Washington | 17 | $681M | 3.1% |
| Missouri | 6 | $150M | 0.7% |
| Largest branches | Place | Deposits |
|---|---|---|
| First Interstate Bank (main office) | Billings, MT | $1.1B |
| Missoula Downtown Branch | Missoula, MT | $600M |
| Sioux Falls Downtown Branch | Sioux Falls, SD | $486M |
| Bend Downtown Branch | Bend, OR | $389M |
| Casper Downtown Branch | Casper, WY | $358M |
| Jackson Main Branch | Jackson, WY | $350M |
| Riverton Branch | Riverton, WY | $344M |
| Great Falls 10Th Ave S Branch | Great Falls, MT | $331M |
| Rapid City Gateway Branch | Rapid City, SD | $327M |
| Clive University Ave. Branch | Clive, IA | $324M |
Related pages
Questions and answers
How big is First Interstate Bank?
$25.8 billion in total assets and $21.7 billion in deposits as of June 30, 2026, with assets down 6.2% from a year before. Its loans were $14.3 billion.
How many branches does First Interstate Bank have?
274 branches in 10 states as of June 30, 2026. The most deposits are in Montana ($6.1 billion).
Is First Interstate Bank profitable?
Yes: it earned $158.4 million from January 1 to June 30, 2026 (up 16.1% from the same months a year before). Its return on assets was 1.21% a year; about 1% is typical.
Who owns First Interstate Bank?
First Interstate Bank is owned by First Interstate BancSystem, Inc., its holding company, which is listed as FIBK.
Official public data from the reports every insured bank files each quarter. Profit so far runs from January 1 to the quarter end. Branch deposits are counted once a year, as of June 30. New quarters appear about two months after the quarter ends.