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First Interstate Bank Near Me

Last updated: August 26, 2026

First Interstate Bank is the largest Mountain West and Northwest US regional bank, with approximately $30 billion in assets and approximately 300+ branches across 14 Western and Midwestern US states (Montana, Wyoming, Idaho, Oregon, Washington, South Dakota, North Dakota, Nebraska, Kansas, Minnesota, Missouri, Iowa, Arizona, Colorado). The bank is headquartered in Billings, Montana, and is the principal subsidiary of First Interstate BancSystem, Inc. (NASDAQ: FIBK). First Interstate was founded in 1968 by Homer Scott Sr., who purchased the Bank of Commerce in Sheridan, Wyoming, and the bank remains family-controlled by the Scott family through three generations. The bank’s most significant recent transaction was the February 1, 2022 merger with Great Western Bancorp ($2 billion all-stock deal), which added 175+ branches across Arizona, Colorado, and 7 Midwestern states, roughly doubling First Interstate’s size.

Map of First Interstate Bank locations near me

Use the First Interstate branch locator below to find the nearest First Interstate Bank in your location, with branch hours, services, and contact details. The map covers all First Interstate Bank branches and ATMs across the 14-state Western and Midwestern footprint. You can click ‘Use my location‘ to view branches and ATMs around you on the map.

First Interstate Bank at a glance

  • Official name: First Interstate Bank (a Montana state-chartered bank, Member FDIC)
  • Parent company: First Interstate BancSystem, Inc. (NASDAQ: FIBK)
  • Founded: 1968 by Homer Scott Sr. (purchased the Bank of Commerce in Sheridan, Wyoming)
  • Headquarters: 401 North 31st Street, Billings, Montana 59101
  • Branches: approximately 300+ across 14 US states (Montana, Wyoming, Idaho, Oregon, Washington, South Dakota, North Dakota, Nebraska, Kansas, Minnesota, Missouri, Iowa, Arizona, Colorado)
  • Total assets: approximately $30 billion
  • Family control: Scott family controlled through three generations since founder Homer Scott Sr.
  • Customer service: 1-855-342-3400 (Monday to Friday 7:30 AM to 7:00 PM Mountain Time; Saturday 9:00 AM to 2:00 PM MT)
  • 24-hour Telephone Banking: 1-888-752-3341 (English and Spanish)
  • Debit card PIN activation (24/7): 1-800-992-3808
  • Debit card dispute (24/7): 1-833-699-0076
  • Primary routing number: 092901683
  • Major recent acquisition: Great Western Bancorp (February 1, 2022, $2 billion all-stock); added 175+ branches across AZ, CO, IA, KS, MN, MO, NE, ND, SD
  • FDIC insurance: yes, deposits insured up to $250,000 per depositor, per insured bank, per account ownership category
  • Stock ticker: FIBK on NASDAQ

First Interstate Bank branch near me

First Interstate Bank operates approximately 300+ retail branches across 14 US states, with the densest concentration in the original Mountain West and Northwest home markets plus the Midwest expansion from the February 2022 Great Western merger. Use the official First Interstate branch locator at firstinterstatebank.com/locations to find a branch with addresses, phone numbers, hours, and services.

First Interstate in Montana (HQ state since 1968)

Montana is First Interstate’s home and densest market, with branches across the state. The bank is headquartered in Billings, Montana (Yellowstone County, the largest city in Montana) at 401 North 31st Street. Major Montana concentrations include Billings, Bozeman, Missoula, Great Falls, Helena (the state capital), Butte, Kalispell (and the Flathead Valley including Whitefish and Columbia Falls), and the Yellowstone-area towns. First Interstate is the largest Montana-headquartered bank.

First Interstate in Wyoming (original founding state)

Wyoming is the state where Homer Scott Sr. founded First Interstate in 1968 by purchasing the Bank of Commerce in Sheridan. The Wyoming footprint covers Cheyenne (the state capital), Casper, Sheridan, Gillette, Rock Springs, Laramie, Cody, and Jackson Hole. First Interstate is the largest bank in Wyoming by branch count.

First Interstate in the Pacific Northwest (Oregon, Washington, Idaho)

The Pacific Northwest footprint covers Oregon (Portland metro, the Willamette Valley, Bend and Central Oregon, the Oregon Coast), Washington (Seattle and the Puget Sound region, Spokane in eastern Washington, Tri-Cities, and Yakima), and Idaho (Boise and the Treasure Valley, Idaho Falls, Twin Falls, Coeur d’Alene). These markets were expanded into through a series of acquisitions in the 2010s.

First Interstate in the Midwest (post-Great Western, 2022)

The Midwestern footprint came into First Interstate through the February 2022 Great Western Bancorp merger. Great Western had been a Sioux Falls, South Dakota-headquartered regional with branches across the Midwest. The added markets include:

  • South Dakota: Sioux Falls (the former Great Western headquarters), Rapid City, and the broader state
  • North Dakota: Fargo, Bismarck, and Grand Forks
  • Nebraska: Omaha, Lincoln, and Grand Island
  • Iowa: Des Moines, Cedar Rapids, Davenport-Quad Cities, and Council Bluffs
  • Kansas: Wichita and Kansas City
  • Minnesota: Twin Cities (Minneapolis and St. Paul), Rochester
  • Missouri: St. Louis and Kansas City

First Interstate in Arizona and Colorado (post-Great Western, 2022)

Arizona branches cover Phoenix and Scottsdale, plus Tucson. Colorado branches cover Denver and the Front Range (Boulder, Fort Collins, Colorado Springs). These markets also came through the Great Western merger.

For the official state list with branch addresses, see firstinterstatebank.com/locations.

First Interstate Bank ATM near me

Use the First Interstate ATM finder to find the closest First Interstate Bank ATM machine around you, including drive-up and 24-hour ATMs at branches. First Interstate operates approximately 300+ ATMs at branches across the 14-state footprint plus additional standalone ATMs in major markets.

  • First Interstate branded ATMs: First Interstate checking and savings customers can use any First Interstate ATM fee-free for withdrawals, deposits, and balance inquiries.
  • Out-of-network ATMs: using a non-First Interstate ATM may incur a fee from First Interstate plus the ATM operator’s surcharge. Some premium account tiers refund a limited number of out-of-network ATM fees per statement cycle.
  • Drive-up ATMs: many First Interstate branches have drive-up ATMs accessible 24/7, particularly in Montana, Wyoming, Idaho, and South Dakota markets where drive-up banking is common.
  • Deposit ATMs: modern First Interstate branch ATMs accept cash and check deposits without an envelope, with funds typically available the next business day.

First Interstate Bank distinctive features and the Scott family heritage

The Scott family: three generations of bank leadership

First Interstate is one of the few large publicly traded US banks that remains continuously family-controlled. Homer Scott Sr. founded First Interstate in 1968 by purchasing the Bank of Commerce in Sheridan, Wyoming. Homer Scott Jr. led the bank through much of its 20th-century expansion across Montana, Wyoming, and the Pacific Northwest. The third Scott generation has continued the bank’s leadership and growth in the 21st century. The Scott family’s continued involvement reflects a conservative, long-term banking culture and is unusual among regional banks of First Interstate’s size.

The February 2022 Great Western Bancorp merger

On February 1, 2022, First Interstate completed its merger with Great Western Bancorp, Inc., a Sioux Falls, South Dakota-headquartered regional bank with approximately $13.5 billion in assets. The all-stock deal was valued at approximately $2 billion and added approximately 175 branches across 9 states: Arizona, Colorado, Iowa, Kansas, Minnesota, Missouri, Nebraska, North Dakota, and South Dakota. The combined company kept the First Interstate name and the Billings, Montana headquarters; the merger of equals roughly doubled First Interstate’s size from approximately $18 billion to $32 billion in assets at closing, and extended the bank’s footprint from a 6-state Mountain West and Northwest regional into a 14-state Western and Midwestern bank.

Mountain West and Northwest specialty

First Interstate’s competitive position is rooted in being the dominant regional bank for Montana, Wyoming, Idaho, and parts of Oregon and Washington. These are markets that mainstream national US banks often serve only thinly, leaving local banking relationships open for community-focused regionals like First Interstate. The bank serves agricultural and ranching customers, oil-and-gas businesses, mining operations, hospitality and tourism businesses (Yellowstone, Glacier, the Tetons), and the broader Mountain West small-business economy.

First Interstate Bank hours, Saturday hours, and open now

First Interstate Bank branch hours vary by location, but most branches follow this typical schedule:

DayTypical hours
Monday to Friday9:00 AM to 5:00 PM lobby; drive-up often opens earlier and closes later in Montana, Wyoming, and South Dakota markets
Saturday9:00 AM to 12:00 PM at many First Interstate branches; some closed Saturday
SundayClosed at all branches

First Interstate Bank branches are closed on the standard 11 US federal holidays. ATMs at all branches are available 24/7 even when the branch is closed. The First Interstate customer service line at 1-855-342-3400 is open Monday to Friday 7:30 AM to 7:00 PM Mountain Time and Saturday 9:00 AM to 2:00 PM MT. Telephone Banking (1-888-752-3341) is 24/7 and supports English and Spanish. For exact hours at your specific branch, use the official First Interstate locator at firstinterstatebank.com/locations.

Federal holidays:

  • New Year’s Day (January 1)
  • Martin Luther King Jr. Day (third Monday of January)
  • Presidents Day (third Monday of February)
  • Memorial Day (last Monday of May)
  • Juneteenth National Independence Day (June 19)
  • Independence Day (July 4)
  • Labor Day (first Monday of September)
  • Columbus Day (second Monday of October)
  • Veterans Day (November 11)
  • Thanksgiving Day (fourth Thursday of November)
  • Christmas Day (December 25)

Is First Interstate Bank open now near me? Most First Interstate branches keep weekday business hours (9 AM to 5 PM local time, mostly Mountain Time or Central Time) plus Saturday morning hours at many locations. ATMs at all branches are available 24/7. Telephone Banking at 1-888-752-3341 is 24/7. Debit card PIN activation and dispute lines are 24/7. The main customer service line is open M-F 7:30 AM-7 PM MT and Saturday 9 AM-2 PM MT.

Contact First Interstate Bank: customer service phone numbers

  • First Interstate Customer Service (main line): 1-855-342-3400 (Monday to Friday 7:30 AM to 7:00 PM Mountain Time; Saturday 9:00 AM to 2:00 PM MT)
  • 24-Hour Telephone Banking (automated, English and Spanish): 1-888-752-3341
  • Debit card PIN activation or reset (24/7): 1-800-992-3808
  • Debit card dispute (24/7): 1-833-699-0076
  • First Interstate Mortgage Servicing: use the main 1-855-342-3400 line and select the mortgage option
  • First Interstate Online and Mobile Banking technical support: 1-855-342-3400 (same as main line)
  • Visit a branch: use the locator at firstinterstatebank.com/locations to find your nearest branch and its direct phone number

First Interstate’s customer service operations are headquartered in Billings, Montana, and most representatives are US-based. The bilingual (English and Spanish) 24-hour Telephone Banking line is a useful feature for routine transactions outside business hours.

About First Interstate Bank: history and the Scott family banking dynasty

Origin: 1968 in Sheridan, Wyoming

First Interstate Bank was founded in 1968 when Homer Scott Sr. purchased the Bank of Commerce in Sheridan, Wyoming. Sheridan is a small Wyoming town near the Montana border, in the heart of the historic Western US ranching and energy economy. Homer Scott Sr. saw an opportunity to build a community bank serving the Mountain West agricultural, ranching, and small-business economy. The “First Interstate” name was eventually adopted as the bank expanded across state lines into Montana, Idaho, and the broader Mountain West.

20th-century expansion across the Mountain West

Through the 1970s, 1980s, 1990s, and 2000s, First Interstate steadily expanded across Montana (its home state since the early 1970s), Wyoming, Idaho, Oregon, Washington, and South Dakota through both organic growth and acquisitions of smaller Mountain West community banks. The Scott family maintained controlling interest and operational leadership through multiple generations, providing continuity that distinguished First Interstate from many other regional banks of comparable size.

The 2010 IPO and 2010s growth phase

First Interstate BancSystem went public on NASDAQ in March 2010 under ticker FIBK. The IPO provided capital for accelerated growth across the Pacific Northwest and additional Mountain West markets. Through the 2010s, the bank pursued a series of smaller acquisitions to expand the Oregon, Washington, and Idaho footprints.

The February 2022 Great Western Bancorp merger

The most significant transaction in First Interstate’s history was the February 1, 2022 merger with Great Western Bancorp, Inc., a Sioux Falls, South Dakota-headquartered regional with approximately $13.5 billion in assets and 175+ branches across the Midwest. The all-stock deal was valued at approximately $2 billion and roughly doubled First Interstate’s size. The combined company kept the First Interstate name and the Billings, Montana headquarters, and extended the bank’s footprint from a 6-state Mountain West and Northwest regional into a 14-state Western and Midwestern bank with approximately $30 billion in assets.

First Interstate today

First Interstate Bank is now a $30 billion regional bank with 300+ branches across 14 US states. The Scott family continues to play a significant role in the bank’s leadership and culture. The bank serves both consumer (checking, savings, mortgages, credit cards) and commercial (commercial banking, agricultural lending, energy lending, treasury management) customers across the Mountain West, Pacific Northwest, and Midwest.

Frequently asked questions

Where is the Nearest First Interstate Bank Branch Near Me?

Use the official First Interstate Bank locator at firstinterstatebank.com/locations to find your nearest branch by ZIP code, city, or state. First Interstate operates approximately 300+ branches across 14 US states (Montana, Wyoming, Idaho, Oregon, Washington, South Dakota, North Dakota, Nebraska, Kansas, Minnesota, Missouri, Iowa, Arizona, Colorado), with the densest concentration in Montana (the home state), Wyoming (the original founding state), and South Dakota (the post-Great Western Midwest hub).

How to Find the Closest First Interstate Bank ATM Around Your Location

Use the First Interstate ATM finder at firstinterstatebank.com/locations to find the closest First Interstate Bank ATM machine around you. First Interstate operates approximately 300+ ATMs at branches and additional standalone locations across its 14-state footprint. ATMs at branches are typically accessible 24/7 even when the branch is closed.

Use the Map to See Locations of First Interstate Bank Around You

The map on this page shows First Interstate Bank branches and ATMs near your location. First Interstate has the densest branch concentrations in Montana (home state since 1968), Wyoming (the original founding state), the Pacific Northwest (Oregon, Washington, Idaho), and the Midwest (South Dakota, North Dakota, Nebraska, Iowa, post the February 2022 Great Western merger). Arizona and Colorado branches were also added through the Great Western merger.

What is the First Interstate Bank customer service phone number?

The main First Interstate Bank customer service number is 1-855-342-3400, available Monday to Friday 7:30 AM to 7:00 PM Mountain Time and Saturday 9:00 AM to 2:00 PM MT. For 24-hour automated Telephone Banking (English and Spanish), call 1-888-752-3341. For debit card PIN activation or reset (24/7), call 1-800-992-3808. For debit card disputes (24/7), call 1-833-699-0076.

What is the First Interstate Bank routing number?

The primary First Interstate Bank routing number is 092901683. The bank may use different routing numbers depending on the state where you opened your account (especially for accounts inherited from the Great Western merger). To find your specific routing number, check the bottom of your checks, log in to First Interstate Online Banking, look in the First Interstate mobile app under account details, or call customer service at 1-855-342-3400.

Is First Interstate Bank FDIC insured?

Yes. First Interstate Bank is FDIC insured. Deposits are insured up to $250,000 per depositor, per insured bank, for each account ownership category.

Where is First Interstate Bank headquartered?

First Interstate Bank is headquartered at 401 North 31st Street, Billings, Montana 59101. The bank has been Billings-headquartered for most of its history. Billings is the largest city in Montana, located in Yellowstone County in south-central Montana.

How many First Interstate Bank locations are there?

First Interstate Bank operates approximately 300+ branches across 14 US states with approximately $30 billion in total assets. The largest concentrations are in Montana (the home state), Wyoming (the original founding state), the Pacific Northwest (Oregon, Washington, Idaho), and the Midwest (South Dakota, North Dakota, Nebraska, Iowa post the February 2022 Great Western merger).

What happened with the Great Western Bancorp merger?

First Interstate completed its $2 billion all-stock merger with Great Western Bancorp on February 1, 2022. Great Western was a Sioux Falls, South Dakota-headquartered regional with approximately $13.5 billion in assets and 175+ branches across the Midwest. The combined company kept the First Interstate name and the Billings, Montana headquarters, and roughly doubled First Interstate’s size from $18 billion to $32 billion at closing. The merger extended the bank’s footprint from a 6-state Mountain West and Northwest regional into a 14-state Western and Midwestern bank.

Is First Interstate Bank family-owned?

First Interstate Bank is publicly traded (NASDAQ: FIBK) since its March 2010 IPO, but remains significantly family-influenced. The Scott family has played a continuous leadership role in the bank since founder Homer Scott Sr. purchased the Bank of Commerce in Sheridan, Wyoming in 1968. Three generations of Scott family members have led or served on the board of the bank or the parent BancSystem.

Are First Interstate Bank branches open on Saturday?

Yes, at many branches. Most First Interstate branches in Montana, Wyoming, Idaho, South Dakota, and Iowa have Saturday hours, typically 9:00 AM to 12:00 PM. Some branches in smaller markets are closed Saturday. Confirm with the specific branch using the locator at firstinterstatebank.com/locations.

Are First Interstate Bank branches open on Sunday?

No. First Interstate Bank branches are closed on Sundays at all locations. ATMs at all branches are available 24/7. The customer service main line is closed Sunday but the 24-hour Telephone Banking line (1-888-752-3341) and debit card activation (1-800-992-3808) and dispute (1-833-699-0076) lines are all 24/7. See our Banks Open on Sunday Near Me page for the list of banks with Sunday hours.

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