Mortgage Lender Index

First Interstate Bank

First Interstate Bank is a state bank, federal reserve member based in Billings, Montana, with $25.8 billion in assets and $21.7 billion in deposits as of 30 June 2026. The FDIC’s 2026 branch survey counts 274 branches in 138 counties.

FDIC certificate1105
Charter classState bank, Federal Reserve member
EstablishedNot published
Assets$25.8 billion
Deposits$21.7 billion
Offices274
Net income, year to date$158.4 million
Return on assets1.21%
Websitewww.firstinterstatebank.com
Mortgage lendingFirst Interstate Bank reported 2,443 mortgages made in 2025.

Branches by county, 2026

CountyBranchesDeposits
Yellowstone County, MT 10$1.8 billion
Minnehaha County, SD 10$954.6 million
Ada County, ID 10$803.2 million
Deschutes County, OR 9$1.1 billion
Douglas County, NE 8$657.5 million
Spokane County, WA 8$508.4 million
Flathead County, MT 7$620.8 million
Pennington County, SD 7$616.4 million
Boulder County, CO 6$240.9 million
Polk County, IA 5$531.1 million
Kootenai County, ID 5$431.5 million
Lancaster County, NE 5$286.6 million
Jackson County, OR 5$277.1 million
Gallatin County, MT 4$689.8 million
Lawrence County, SD 4$298.5 million
Missoula County, MT 3$824.9 million
Natrona County, WY 3$580.6 million
Cascade County, MT 3$512.8 million
Lewis and Clark County, MT 3$465.9 million
Story County, IA 3$136.7 million
Jasper County, IA 3$117.0 million
Larimer County, CO 3$113.9 million
Fremont County, WY 2$458.7 million
Teton County, WY 2$381.3 million
Campbell County, WY 2$356.2 million
Sheridan County, WY 2$328.7 million
Canyon County, ID 2$262.3 million
Laramie County, WY 2$255.6 million
Sarpy County, NE 2$224.8 million
Park County, MT 2$223.2 million
Josephine County, OR 2$189.6 million
Brown County, SD 2$188.7 million
Codington County, SD 2$179.6 million
Webster County, IA 2$153.6 million
Denver County, CO 2$150.8 million
Marshall County, IA 2$147.6 million
Rosebud County, MT 2$135.7 million
Custer County, SD 2$112.2 million
Weld County, CO 2$101.3 million
Lane County, OR 2$97.4 million
Dawson County, NE 2$94.5 million
Lincoln County, SD 2$85.2 million
Pottawattamie County, IA 2$85.1 million
Douglas County, OR 2$78.6 million
El Paso County, CO 2$76.2 million
Stillwater County, MT 2$72.6 million
Lincoln County, OR 2$71.2 million
Montgomery County, IA 2$70.1 million
Fremont County, IA 2$64.2 million
Coos County, OR 2$53.8 million
Wayne County, IA 2$53.5 million
Black Hawk County, IA 2$44.5 million
Dallas County, IA 2$40.8 million
Corson County, SD 2$34.3 million
Page County, IA 2$31.2 million
Whitman County, WA 2$28.8 million
Albany County, WY 1$303.6 million
Meade County, SD 1$259.0 million
Lake County, MT 1$167.5 million
Custer County, MT 1$159.7 million
Des Moines County, IA 1$113.9 million
Johnson County, WY 1$108.0 million
Crook County, OR 1$99.5 million
Hood River County, OR 1$97.4 million
Big Horn County, MT 1$94.5 million
Butte County, SD 1$91.0 million
Carbon County, MT 1$86.4 million
Ravalli County, MT 1$81.4 million
Elmore County, ID 1$80.6 million
Grant County, SD 1$79.2 million
Gem County, ID 1$77.1 million
Fall River County, SD 1$75.9 million
Adams County, NE 1$75.9 million
Lincoln County, NE 1$75.8 million
Multnomah County, OR 1$68.3 million
Lake County, SD 1$67.5 million
Brule County, SD 1$65.2 million
Klamath County, OR 1$64.5 million
Walworth County, SD 1$60.6 million
Marion County, OR 1$58.7 million
Wasco County, OR 1$55.6 million
Platte County, NE 1$54.7 million
Potter County, SD 1$51.5 million
Glacier County, MT 1$49.5 million
Decatur County, IA 1$48.9 million
Worth County, MO 1$46.7 million
Madison County, MT 1$46.1 million
Hall County, NE 1$46.1 million
Arapahoe County, CO 1$44.8 million
Poweshiek County, IA 1$44.3 million
Warren County, IA 1$43.5 million
Buffalo County, NE 1$43.2 million
Payette County, ID 1$39.2 million
Clarke County, IA 1$38.3 million
Hutchinson County, SD 1$38.2 million
Pacific County, WA 1$36.0 million
Lincoln County, MT 1$34.5 million
Spink County, SD 1$34.1 million
Fremont County, CO 1$34.0 million
Clatsop County, OR 1$33.7 million
Phelps County, NE 1$31.3 million
Gentry County, MO 1$30.5 million
Lucas County, IA 1$30.2 million
Yankton County, SD 1$30.1 million
Mercer County, MO 1$30.0 million
Roberts County, SD 1$28.8 million
Ringgold County, IA 1$28.5 million
Davison County, SD 1$27.8 million
Brookings County, SD 1$27.3 million
Grays Harbor County, WA 1$25.2 million
Broomfield County, CO 1$25.2 million
Cass County, IA 1$24.0 million
Jefferson County, OR 1$23.7 million
Johnson County, IA 1$23.3 million
Klickitat County, WA 1$23.2 million
Tama County, IA 1$21.2 million
Jefferson County, CO 1$21.1 million
Richardson County, NE 1$20.2 million
Day County, SD 1$20.1 million
Saunders County, NE 1$19.9 million
Gage County, NE 1$19.9 million
Clackamas County, OR 1$19.7 million
Mills County, IA 1$19.2 million
Taylor County, IA 1$18.5 million
Sullivan County, MO 1$18.1 million
Linn County, IA 1$17.9 million
Dodge County, NE 1$17.9 million
Henry County, IA 1$17.2 million
Otoe County, NE 1$16.3 million
Union County, IA 1$16.0 million
Saline County, NE 1$15.9 million
King County, WA 1$15.8 million
Wahkiakum County, WA 1$15.5 million
Grant County, WA 1$14.4 million
Benton County, WA 1$13.5 million
Putnam County, MO 1$13.3 million
Harrison County, MO 1$11.5 million
Woodbury County, IA 1$3.7 million

Closed since the 2025 survey

29 branches in the 2025 survey have no 2026 row: closed, sold, or moved.

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Counts, medians and denial shares are computed from the Home Mortgage Disclosure Act loan-level file for 2025, published by the Consumer Financial Protection Bureau through the FFIEC: every application a covered lender received, as the lender reported it. Branches and deposits come from the FDIC Summary of Deposits as of 30 June 2026, and bank balance sheets from the FDIC institutions directory. A median rate is what borrowers got, not what you will be offered — it depends on the loan, the property, your credit and the market on the day, and no figure here is a quote. A median over fewer than 10 loans is not shown: it is a number with no meaning and a real person's rate half-exposed. Those cells say "under 10 loans" and the count is still published. This is information, not advice, and no lender pays to appear.