RANKING · Q2 2026

Highest net interest margin in Iowa

194 of 227 banks in Iowa that filed for the quarter ended June 30, 2026 are ranked. At least $100 million in total assets. Institutions with equal values share a rank. Source: FDIC quarterly financial data.

Highest net interest margin in Iowa, Q2 2026
Rank	Institution	Headquarters	Net interest margin	Total assets
1	Security State Bank	Algona, IA	5.19%	$110 million
2	Heartland Bank	Somers, IA	5.07%	$256 million
3	First Iowa State Bank	Albia, IA	4.93%	$396 million
4	Bridge Community Bank	Mount Vernon, IA	4.93%	$141 million
5	Security Savings Bank	Gowrie, IA	4.85%	$194 million
6	Solon State Bank	Solon, IA	4.71%	$122 million
7	Bank	Wapello, IA	4.69%	$217 million
8	Fnnb Bank	Newton, IA	4.66%	$109 million
9	Bank Plus	Estherville, IA	4.58%	$145 million
10	Farmers Trust and Savings Bank	Williamsburg, IA	4.56%	$192 million
11	Audubon State Bank	Audubon, IA	4.56%	$155 million
12	The State Bank of Toledo	Toledo, IA	4.54%	$135 million
13	Farmers & Merchants Savings Bank	Manchester, IA	4.53%	$617 million
14	Midwest Heritage Bank FSB	West Des Moines, IA	4.50%	$768 million
15	Houghton State Bank	Red Oak, IA	4.41%	$205 million
16	First State Bank	Lynnville, IA	4.33%	$384 million
17	Cedar Valley Bank & Trust	La Porte City, IA	4.32%	$126 million
18	Libertyville Savings Bank	Fairfield, IA	4.31%	$384 million
19	First Bank Hampton	Hampton, IA	4.31%	$241 million
20	State Savings Bank	Bedford, IA	4.28%	$207 million
21	Fnb Bank	Fontanelle, IA	4.27%	$275 million
22	Security State Bank	Sutherland, IA	4.26%	$492 million
23	American State Bank	Osceola, IA	4.26%	$361 million
24	Gnb Bank	Grundy Center, IA	4.26%	$621 million
25	Success Bank	Bloomfield, IA	4.24%	$277 million
26	Farmers State Bank	Northwood, IA	4.22%	$221 million
27	Citizens First National Bank	Storm Lake, IA	4.22%	$256 million
28	Farmers Trust & Savings Bank	Buffalo Center, IA	4.22%	$423 million
29	South Story Bank & Trust	Slater, IA	4.19%	$624 million
30	Hiawatha Bank & Trust Company	Hiawatha, IA	4.18%	$157 million
31	Bankiowa	Cedar Rapids, IA	4.17%	$846 million
32	Clear Lake Bank and Trust Company	Clear Lake, IA	4.17%	$649 million
33	Peoples Bank	Rock Valley, IA	4.15%	$1.3 billion
34	Iowa Falls State Bank	Iowa Falls, IA	4.15%	$202 million
35	Rolling Hills Bank & Trust	Atlantic, IA	4.15%	$484 million
36	Farmers Savings Bank	Marshalltown, IA	4.14%	$140 million
37	Bellevue State Bank	Bellevue, IA	4.11%	$188 million
38	Bank Midwest	Spirit Lake, IA	4.09%	$1.3 billion
39	Shelby County State Bank	Harlan, IA	4.08%	$524 million
40	Ohnward Bank & Trust	Cascade, IA	4.08%	$499 million
41	First Community Bank	Newell, IA	4.08%	$116 million
42	Premier Bank	Rock Valley, IA	4.07%	$826 million
43	Glenwood State Bank	Glenwood, IA	4.06%	$353 million
44	Westside State Bank	Westside, IA	4.04%	$269 million
45	Raccoon Valley Bank	Perry, IA	4.04%	$486 million
46	Cbi Bank & Trust	Muscatine, IA	4.03%	$1.7 billion
47	Templeton Savings Bank	Templeton, IA	4.03%	$170 million
48	Farmers State Bank	Algona, IA	4.03%	$150 million
49	Farmers Trust & Savings Bank	Earling, IA	4.03%	$148 million
50	Community Bank	Dunlap, IA	4.01%	$138 million
51	First Trust and Savings Bank	Wheatland, IA	4.01%	$321 million
52	Liberty National Bank	Sioux City, IA	3.97%	$624 million
53	Marion County State Bank	Pella, IA	3.96%	$629 million
54	Midstates Bank N.A.	Council Bluffs, IA	3.95%	$654 million
55	Federation Bank	Washington, IA	3.95%	$156 million
56	Twin Cedars Bank	Bussey, IA	3.95%	$118 million
57	First State Bank	Stuart, IA	3.95%	$130 million
58	Pinnacle Bank	Marshalltown, IA	3.94%	$324 million
59	Pilot Grove Savings Bank	Pilot Grove, IA	3.92%	$1.2 billion
60	Decorah Bank and Trust Company	Decorah, IA	3.92%	$794 million
61	Citizens State Bank	Wyoming, IA	3.91%	$138 million
62	Malvern Bank	Malvern, IA	3.91%	$253 million
63	Union State Bank	Winterset, IA	3.90%	$136 million
64	Union State Bank	Greenfield, IA	3.90%	$169 million
65	American Bank N.A.	Le Mars, IA	3.89%	$533 million
66	Community Bank & Trust Company	Muscatine, IA	3.88%	$303 million
67	Hills Bank and Trust Company	Hills, IA	3.88%	$4.8 billion
68	Connection Bank	Fort Madison, IA	3.88%	$541 million
69	First Bank	Waverly, IA	3.88%	$740 million
70	Visionbank of Iowa	Ames, IA	3.87%	$896 million
71	Earlham Savings Bank	West Des Moines, IA	3.86%	$383 million
72	Mediapolis Savings Bank	Mediapolis, IA	3.86%	$270 million
73	Bank Iowa	West Des Moines, IA	3.85%	$2.3 billion
74	Sibley State Bank	Sibley, IA	3.85%	$104 million
75	Crawford County Trust and Savings Bank	Denison, IA	3.84%	$294 million
76	Grinnell State Bank	Grinnell, IA	3.83%	$499 million
77	Iowa State Savings Bank	Creston, IA	3.83%	$277 million
78	Primebank	Le Mars, IA	3.82%	$801 million
79	Leighton State Bank	Pella, IA	3.82%	$298 million
80	Exchange State Bank	Ames, IA	3.80%	$146 million
81	Dewitt Bank & Trust Co.	Dewitt, IA	3.80%	$277 million
82	Pioneer Bank	Sergeant Bluff, IA	3.80%	$283 million
83	Cusb Bank	Cresco, IA	3.79%	$812 million
84	United Bank & Trust Co.	Marshalltown, IA	3.78%	$120 million
85	Farmers State Bank	Marion, IA	3.76%	$1.1 billion
86	Northwest Bank	Spencer, IA	3.75%	$3.0 billion
87	Iowa State Bank	Hull, IA	3.75%	$1.3 billion
88	Farmers & Merchants Bank & Trust	Burlington, IA	3.75%	$208 million
89	Commercial Savings Bank	Carroll, IA	3.74%	$349 million
90	Manufacturers Bank & Trust Company	Forest City, IA	3.74%	$738 million
91	Iowa Trust and Savings Bank	Centerville, IA	3.73%	$211 million
92	Farmers & Merchants State Bank	Winterset, IA	3.72%	$272 million
93	Trubank	Indianola, IA	3.71%	$495 million
94	American State Bank	Sioux Center, IA	3.71%	$1.4 billion
95	Cedar Rapids Bank and Trust Company	Cedar Rapids, IA	3.71%	$2.9 billion
96	Kerndt Brothers Savings Bank	Lansing, IA	3.70%	$347 million
97	Charter Bank	Johnston, IA	3.69%	$228 million
98	First Citizens Bank	Mason City, IA	3.68%	$1.8 billion
99	Waukon State Bank	Waukon, IA	3.68%	$427 million
100	Central Bank	Storm Lake, IA	3.68%	$2.3 billion

Rankings sort one published measure; they are not an overall judgment of any institution. Methodology · All rankings