RANKING · Q2 2026

Highest net interest margin in Wisconsin

142 of 155 banks in Wisconsin 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 Wisconsin, Q2 2026
Rank	Institution	Headquarters	Net interest margin	Total assets
1	Ixonia Bank	Ixonia, WI	8.08%	$1.1 billion
2	Bank of Lake Mills	Lake Mills, WI	6.95%	$534 million
3	John Deere Financial, F.S.B.	Middleton, WI	6.16%	$4.9 billion
4	The First National Bank of Bangor	Bangor, WI	5.21%	$364 million
5	First Federal Bank of Wisconsin	Waukesha, WI	4.94%	$286 million
6	Security State Bank	Iron River, WI	4.86%	$136 million
7	Conservation First Bank	Benton, WI	4.85%	$127 million
8	Wolf River Community Bank	Hortonville, WI	4.85%	$386 million
9	Great North Bank	Florence, WI	4.68%	$233 million
10	Waukesha State Bank	Waukesha, WI	4.64%	$1.6 billion
11	Crossbridge Community Bank	Tomahawk, WI	4.61%	$217 million
12	Alliance Bank	Mondovi, WI	4.57%	$266 million
13	Citizens State Bank	Cadott, WI	4.57%	$238 million
14	Forward Bank	Marshfield, WI	4.53%	$1.3 billion
15	Community Bank of Cameron	Cameron, WI	4.52%	$227 million
16	State Bank of Chilton	Chilton, WI	4.50%	$517 million
17	National Bank of Commerce	Superior, WI	4.49%	$2.2 billion
18	First National Community Bank	New Richmond, WI	4.47%	$345 million
19	Citizens First Bank	Viroqua, WI	4.45%	$344 million
20	The Bank of Kaukauna	Kaukauna, WI	4.41%	$176 million
21	Farmers & Merchants Bank & Trust	Marinette, WI	4.40%	$175 million
22	State Bank of Newburg	Newburg, WI	4.38%	$328 million
23	Fortifi Bank	Berlin, WI	4.38%	$750 million
24	Bristol Morgan Bank	Oakfield, WI	4.36%	$191 million
25	Bluff View Bank	Galesville, WI	4.35%	$153 million
26	West Pointe Bank	Oshkosh, WI	4.32%	$369 million
27	Waumandee State Bank	Waumandee, WI	4.31%	$345 million
28	The Bank of New Glarus	New Glarus, WI	4.28%	$823 million
29	Horicon Bank	Horicon, WI	4.25%	$1.7 billion
30	Nicolet National Bank	Green Bay, WI	4.25%	$15.4 billion
31	Ergo Bank	Markesan, WI	4.24%	$277 million
32	Royal Bank	Elroy, WI	4.23%	$816 million
33	Paper City Savings Bank, S.A.	Wisconsin Rapids, WI	4.23%	$208 million
34	Bay Bank	Green Bay, WI	4.22%	$316 million
35	The Northwestern Bank	Chippewa Falls, WI	4.22%	$726 million
36	The Farmers State Bank of Waupaca	Waupaca, WI	4.20%	$279 million
37	Bank of Alma	Alma, WI	4.18%	$340 million
38	Oostburg State Bank	Oostburg, WI	4.18%	$440 million
39	Forte Bank	Hartford, WI	4.18%	$404 million
40	Bank First N.A.	Manitowoc, WI	4.17%	$5.9 billion
41	Bank of Milton	Milton, WI	4.17%	$221 million
42	Westbury Bank	Waukesha, WI	4.17%	$772 million
43	Black River Country Bank	Black River Fall, WI	4.17%	$102 million
44	Badger Bank	Fort Atkinson, WI	4.16%	$206 million
45	Bank Cmg	Madison, WI	4.16%	$1.1 billion
46	Citizens State Bank - La Crosse	La Crosse, WI	4.15%	$649 million
47	Chippewa Valley Bank	Hayward, WI	4.15%	$736 million
48	The Bank of Deerfield	Deerfield, WI	4.14%	$268 million
49	Security Bank	New Auburn, WI	4.11%	$254 million
50	The Stephenson National Bank and Trust	Marinette, WI	4.08%	$677 million
51	Northern State Bank	Ashland, WI	4.08%	$331 million
52	Farmers & Merchants Union Bank	Columbus, WI	4.07%	$872 million
53	First State Bank	New London, WI	4.07%	$558 million
54	Oakwood Bank	Pigeon Falls, WI	4.07%	$156 million
55	Pillar Bank	Baldwin, WI	4.04%	$267 million
56	National Exchange Bank and Trust	Fond Du Lac, WI	4.03%	$2.9 billion
57	Collins State Bank	Collins, WI	4.02%	$301 million
58	North Shore Bank	Brookfield, WI	4.01%	$2.6 billion
59	The International Bank of Amherst	Amherst, WI	3.98%	$104 million
60	First Community Bank	Milton, WI	3.98%	$159 million
61	Community State Bank	Union Grove, WI	3.97%	$667 million
62	Woodford State Bank	Monroe, WI	3.97%	$523 million
63	First Citizens State Bank	Whitewater, WI	3.97%	$525 million
64	Incrediblebank	Wausau, WI	3.96%	$2.1 billion
65	Citizens Bank	Mukwonago, WI	3.95%	$1.2 billion
66	Unity Bank	Augusta, WI	3.93%	$575 million
67	Community First Bank	Boscobel, WI	3.93%	$634 million
68	Union State Bank	West Salem, WI	3.92%	$118 million
69	Peoples State Bank	Prairie Du Chien, WI	3.91%	$993 million
70	Cleveland State Bank	Cleveland, WI	3.90%	$246 million
71	Security Financial Bank	Durand, WI	3.89%	$1.0 billion
72	Mound City Bank	Platteville, WI	3.88%	$551 million
73	Bank of Luxemburg	Luxemburg, WI	3.87%	$723 million
74	Citizens State Bank	Hudson, WI	3.87%	$488 million
75	First Business Bank	Madison, WI	3.86%	$4.4 billion
76	The Peoples Community Bank	Mazomanie, WI	3.85%	$389 million
77	Premierbank	Fort Atkinson, WI	3.84%	$584 million
78	Premier Community Bank	Marion, WI	3.83%	$552 million
79	Partners Bank	Marshfield, WI	3.82%	$294 million
80	Spring Bank	Brookfield, WI	3.78%	$441 million
81	River Falls State Bank	River Falls, WI	3.77%	$143 million
82	Richland County Bank	Richland Center, WI	3.76%	$114 million
83	Bank of Wisconsin Dells	Wisconsin Dells, WI	3.76%	$1.1 billion
84	Bank Five Nine	Oconomowoc, WI	3.75%	$2.5 billion
85	Bank of Mauston	Mauston, WI	3.74%	$427 million
86	Bank of Cashton	Cashton, WI	3.74%	$146 million
87	Tri City National Bank	Oak Creek, WI	3.73%	$2.0 billion
88	Oak Bank	Fitchburg, WI	3.72%	$486 million
89	Woodtrust Bank	Wisconsin Rapids, WI	3.70%	$735 million
90	Northwestern Mutual Wealth Management Company	Milwaukee, WI	3.70%	$558 million
91	One Community Bank	Oregon, WI	3.68%	$2.6 billion
92	The Portage County Bank	Almond, WI	3.66%	$210 million
93	Abbybank	Abbotsford, WI	3.65%	$662 million
94	Coulee Bank	La Crosse, WI	3.64%	$524 million
95	Keysavings Bank	Wisconsin Rapids, WI	3.63%	$129 million
96	Johnson Bank	Racine, WI	3.62%	$7.1 billion
97	Peoples State Bank	Wausau, WI	3.61%	$1.5 billion
98	Bonduel State Bank	Bonduel, WI	3.61%	$132 million
99	Marathon Bank	Wausau, WI	3.60%	$261 million
100	Baraboo State Bank	Baraboo, WI	3.59%	$570 million

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