Market Intelligence › Institutions › First Interstate Bank

First Interstate Bank holds $23.0B in deposits across 155 counties in 35 ranked markets and 14 states. Its deposit footprint is broadly distributed: the top three counties (Yellowstone County, Deschutes County, Minnehaha County) hold 18% of its deposits, and Montana accounts for 27% of the total. It ranks among the three largest institutions in 55 of the 155 counties where it operates.

Deposit footprint

Total Deposits

$23.0B

June 30, 2025, nominal

Counties

155

where it holds deposits

Branches

302

reported offices

Ranked Markets

CSAs / MSAs touched

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Deposits by county

Data as of June 30, 2025 (FDIC Summary of Deposits)

	County	Deposits	County’s % of Bank’s Deposits	Bank’s % of County Deposits	Branches
1.	Yellowstone County, MT	$2.0B	8.5%	26.6%	9
2.	Deschutes County, OR	$1.1B	4.9%	22.5%	9
3.	Minnehaha County, SD	$965M	4.2%	0.3%	10
4.	Missoula County, MT	$825M	3.6%	22.4%	3
5.	Ada County, ID	$791M	3.4%	5.4%	10
6.	Gallatin County, MT	$684M	3.0%	13.6%	4
7.	Flathead County, MT	$663M	2.9%	17.4%	7
8.	Douglas County, NE	$651M	2.8%	2.0%	8
9.	Pennington County, SD	$622M	2.7%	19.2%	7
10.	Spokane County, WA	$589M	2.6%	4.2%	8
11.	Natrona County, WY	$589M	2.6%	23.4%	3
12.	Polk County, IA	$549M	2.4%	1.8%	5
13.	Fremont County, WY	$486M	2.1%	46.6%	2
14.	Cascade County, MT	$482M	2.1%	23.3%	3
15.	Lewis And Clark County, MT	$428M	1.9%	18.0%	3
16.	Kootenai County, ID	$406M	1.8%	8.4%	5
17.	Teton County, WY	$389M	1.7%	14.9%	2
18.	Campbell County, WY	$354M	1.5%	25.1%	2
19.	Sheridan County, WY	$330M	1.4%	24.3%	2
20.	Jackson County, OR	$316M	1.4%	6.9%	5
21.	Albany County, WY	$304M	1.3%	36.1%	1
22.	Lancaster County, NE	$284M	1.2%	2.0%	7
23.	Lawrence County, SD	$275M	1.2%	31.1%	4
24.	Boulder County, CO	$264M	1.1%	2.2%	6
25.	Laramie County, WY	$253M	1.1%	8.7%	2
26.	Canyon County, ID	$251M	1.1%	8.9%	2
27.	Meade County, SD	$244M	1.1%	52.9%	1
28.	Pinal County, AZ	$240M	1.0%	7.2%	4
29.	Park County, MT	$223M	1.0%	38.7%	2
30.	Sarpy County, NE	$216M	0.9%	6.6%	3
31.	Codington County, SD	$206M	0.9%	13.5%	2
32.	Josephine County, OR	$203M	0.9%	10.0%	2
33.	Pima County, AZ	$179M	0.8%	1.0%	1
34.	Brown County, SD	$177M	0.8%	9.0%	2
35.	Webster County, IA	$165M	0.7%	17.0%	2
36.	Marshall County, IA	$159M	0.7%	11.0%	2
37.	Custer County, MT	$151M	0.7%	17.8%	1
38.	Denver County, CO	$150M	0.7%	0.3%	2
39.	Rosebud County, MT	$141M	0.6%	49.2%	2
40.	Story County, IA	$138M	0.6%	4.4%	3
41.	Lake County, MT	$136M	0.6%	17.1%	1
42.	Maricopa County, AZ	$122M	0.5%	0.1%	3
43.	Larimer County, CO	$120M	0.5%	1.2%	3
44.	Custer County, SD	$115M	0.5%	76.4%	2
45.	Jasper County, IA	$112M	0.5%	12.9%	3
46.	Johnson County, WY	$110M	0.5%	19.0%	1
47.	Des Moines County, IA	$109M	0.5%	7.3%	1
48.	Weld County, CO	$102M	0.4%	1.6%	2
49.	Carbon County, MT	$98M	0.4%	36.7%	1
50.	Lane County, OR	$98M	0.4%	1.5%	2
51.	Crook County, OR	$94M	0.4%	25.5%	1
52.	Big Horn County, MT	$94M	0.4%	32.0%	1
53.	Lincoln County, SD	$93M	0.4%	0.0%	2
54.	Hood River County, OR	$91M	0.4%	13.2%	1
55.	Butte County, SD	$90M	0.4%	29.1%	1
56.	Johnson County, KS	$88M	0.4%	0.3%	2
57.	Pottawattamie County, IA	$85M	0.4%	3.4%	2
58.	Ravalli County, MT	$84M	0.4%	6.7%	1
59.	Elmore County, ID	$84M	0.4%	29.0%	1
60.	Holt County, NE	$83M	0.4%	13.4%	2
61.	Douglas County, OR	$82M	0.4%	1.2%	2
62.	Dawson County, NE	$81M	0.4%	5.7%	2
63.	Grant County, SD	$80M	0.3%	20.9%	1
64.	Montgomery County, IA	$74M	0.3%	20.5%	2
65.	Lake County, SD	$74M	0.3%	16.9%	1
66.	Gem County, ID	$72M	0.3%	24.1%	1
67.	Lincoln County, OR	$71M	0.3%	6.0%	2
68.	Multnomah County, OR	$71M	0.3%	0.2%	1
69.	Fall River County, SD	$71M	0.3%	71.5%	1
70.	Stillwater County, MT	$70M	0.3%	27.2%	2
71.	Lincoln County, NE	$70M	0.3%	5.0%	1
72.	Fremont County, IA	$68M	0.3%	28.2%	2
73.	El Paso County, CO	$67M	0.3%	0.6%	2
74.	Gila County, AZ	$63M	0.3%	6.8%	1
75.	Wasco County, OR	$63M	0.3%	10.2%	1
76.	Adams County, NE	$62M	0.3%	4.5%	1
77.	Brule County, SD	$61M	0.3%	17.5%	1
78.	Walworth County, SD	$60M	0.3%	14.7%	1
79.	Wayne County, IA	$60M	0.3%	29.6%	2
80.	Marion County, OR	$60M	0.3%	0.9%	1
81.	Klamath County, OR	$59M	0.3%	5.5%	1
82.	Custer County, NE	$56M	0.2%	10.7%	2
83.	Platte County, NE	$54M	0.2%	3.1%	1
84.	Glacier County, MT	$53M	0.2%	27.2%	1
85.	Coos County, OR	$53M	0.2%	4.1%	2
86.	Decatur County, IA	$51M	0.2%	27.3%	1
87.	Potter County, SD	$50M	0.2%	25.1%	1
88.	Poweshiek County, IA	$49M	0.2%	8.6%	1
89.	Worth County, MO	$47M	0.2%	100.0%	1
90.	Arapahoe County, CO	$44M	0.2%	0.2%	1
91.	Dallas County, IA	$44M	0.2%	1.9%	2
92.	Madison County, MT	$43M	0.2%	15.1%	1
93.	Warren County, IA	$43M	0.2%	3.4%	1
94.	Hall County, NE	$43M	0.2%	1.4%	2
95.	Clarke County, IA	$41M	0.2%	13.0%	1
96.	Black Hawk County, IA	$39M	0.2%	1.4%	2
97.	Garfield County, NE	$38M	0.2%	38.7%	1
98.	Payette County, ID	$38M	0.2%	7.9%	1
99.	Buffalo County, NE	$37M	0.2%	1.7%	1
100.	Mercer County, MO	$37M	0.2%	42.0%	1
101.	Lincoln County, MT	$37M	0.2%	9.7%	1
102.	Hutchinson County, SD	$36M	0.2%	7.7%	1
103.	Pacific County, WA	$36M	0.2%	10.1%	1
104.	Fremont County, CO	$34M	0.1%	4.6%	1
105.	Corson County, SD	$33M	0.1%	52.1%	2
106.	Clatsop County, OR	$32M	0.1%	3.7%	1
107.	Page County, IA	$32M	0.1%	4.6%	2
108.	Gentry County, MO	$32M	0.1%	13.4%	1
109.	Spink County, SD	$31M	0.1%	12.8%	1
110.	Yankton County, SD	$31M	0.1%	2.3%	1
111.	Phelps County, NE	$31M	0.1%	6.4%	1
112.	Roberts County, SD	$30M	0.1%	6.6%	1
113.	Ringgold County, IA	$30M	0.1%	21.6%	1
114.	Lucas County, IA	$29M	0.1%	18.2%	1
115.	Valley County, NE	$29M	0.1%	12.3%	1
116.	Whitman County, WA	$27M	0.1%	3.2%	2
117.	Benton County, WA	$27M	0.1%	0.8%	1
118.	Clackamas County, OR	$27M	0.1%	0.3%	1
119.	Broomfield County, CO	$27M	0.1%	1.4%	1
120.	Grays Harbor County, WA	$26M	0.1%	1.8%	1
121.	Davison County, SD	$26M	0.1%	2.4%	1
122.	Cass County, IA	$25M	0.1%	1.7%	1
123.	Johnson County, IA	$24M	0.1%	0.5%	1
124.	Jefferson County, OR	$24M	0.1%	11.3%	1
125.	Sullivan County, MO	$24M	0.1%	12.3%	1
126.	Klickitat County, WA	$23M	0.1%	5.5%	1
127.	Cass County, ND	$23M	0.1%	0.2%	1
128.	Scotts Bluff County, NE	$22M	0.1%	1.7%	1
129.	Gage County, NE	$22M	0.1%	2.6%	1
130.	Brookings County, SD	$22M	0.1%	1.0%	1
131.	Day County, SD	$21M	0.1%	9.4%	1
132.	Saunders County, NE	$21M	0.1%	2.3%	1
133.	Taylor County, IA	$21M	0.1%	9.5%	1
134.	Tama County, IA	$21M	0.1%	5.0%	1
135.	Richardson County, NE	$21M	0.1%	5.4%	1
136.	Mills County, IA	$20M	0.1%	3.2%	1
137.	Madison County, NE	$19M	0.1%	0.8%	1
138.	Dodge County, NE	$19M	0.1%	1.0%	1
139.	Woodbury County, IA	$18M	0.1%	0.5%	1
140.	King County, WA	$18M	0.1%	0.0%	1
141.	Jefferson County, CO	$18M	0.1%	0.1%	1
142.	Santa Cruz County, AZ	$18M	0.1%	1.6%	1
143.	Henry County, IA	$17M	0.1%	3.3%	1
144.	Otoe County, NE	$16M	0.1%	2.7%	1
145.	Union County, IA	$16M	0.1%	3.1%	1
146.	Cheyenne County, NE	$16M	0.1%	3.7%	1
147.	Saline County, NE	$16M	0.1%	2.6%	1
148.	Wahkiakum County, WA	$14M	0.1%	20.4%	1
149.	Harrison County, MO	$14M	0.1%	3.8%	1
150.	Grant County, WA	$14M	0.1%	0.8%	1
151.	Putnam County, MO	$13M	0.1%	5.5%	1
152.	Linn County, IA	$13M	0.1%	0.2%	1
153.	Lyon County, MN	$12M	0.1%	1.1%	1
154.	Red Willow County, NE	$12M	0.1%	1.9%	1
155.	Box Butte County, NE	$12M	0.1%	3.6%	1

Deposits are as reported to the FDIC at branch level, June 30, 2025, and are nominal. “County’s % of Bank’s Deposits” is this county’s share of the institution’s total deposits; “Bank’s % of County Deposits” is this institution’s deposits as a percent of all deposits booked in that county. Counties within a Combined or Metropolitan Statistical Area link to their full profile; other counties are shown for completeness.

All 293 markets and the 1,533 counties within a CSA or MSA are covered in the Market Intelligence resource. See the methodology for how each figure is built and when to expect updates.