RANKING ·
Largest net interest margin improvement 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 and a comparable quarter a year earlier. Institutions with equal values share a rank. Source: FDIC quarterly financial data.
| Rank | Institution | Headquarters | Net interest margin, change over 12 months | Total assets |
|---|---|---|---|---|
| 1 | Bank of Lake Mills | Lake Mills, WI | +155 bps | $534 million |
| 2 | Bank of Sun Prairie | Sun Prairie, WI | +109 bps | $841 million |
| 3 | First National Community Bank | New Richmond, WI | +104 bps | $345 million |
| 4 | Bluff View Bank | Galesville, WI | +71 bps | $153 million |
| 5 | River Bank | Stoddard, WI | +68 bps | $1.0 billion |
| 6 | Forte Bank | Hartford, WI | +68 bps | $404 million |
| 7 | Alliance Bank | Mondovi, WI | +64 bps | $266 million |
| 8 | Paper City Savings Bank, S.A. | Wisconsin Rapids, WI | +63 bps | $208 million |
| 9 | Keysavings Bank | Wisconsin Rapids, WI | +61 bps | $129 million |
| 10 | One Community Bank | Oregon, WI | +61 bps | $2.6 billion |
| 11 | Blc Community Bank | Little Chute, WI | +61 bps | $475 million |
| 12 | First Citizens State Bank | Whitewater, WI | +60 bps | $525 million |
| 13 | The Port Washington State Bank | Port Washington, WI | +60 bps | $1.0 billion |
| 14 | Bankers' Bank | Madison, WI | +60 bps | $1.5 billion |
| 15 | Great North Bank | Florence, WI | +59 bps | $233 million |
| 16 | Citizens First Bank | Viroqua, WI | +59 bps | $344 million |
| 17 | Bank Five Nine | Oconomowoc, WI | +58 bps | $2.5 billion |
| 18 | Great Midwest Bank, State Savings Bank | Brookfield, WI | +57 bps | $1.1 billion |
| 19 | Prevail Bank | Medford, WI | +57 bps | $1.0 billion |
| 20 | The Bank of Kaukauna | Kaukauna, WI | +55 bps | $176 million |
| 21 | Badger Bank | Fort Atkinson, WI | +55 bps | $206 million |
| 22 | First Federal Bank of Wisconsin | Waukesha, WI | +54 bps | $286 million |
| 23 | First State Bank | New London, WI | +52 bps | $558 million |
| 24 | Mound City Bank | Platteville, WI | +52 bps | $551 million |
| 25 | Farmers & Merchants Bank & Trust | Marinette, WI | +51 bps | $175 million |
| 26 | Oostburg State Bank | Oostburg, WI | +51 bps | $440 million |
| 27 | The Stephenson National Bank and Trust | Marinette, WI | +51 bps | $677 million |
| 28 | Union State Bank | West Salem, WI | +51 bps | $118 million |
| 29 | River Falls State Bank | River Falls, WI | +50 bps | $143 million |
| 30 | Farmers & Merchants State Bank | Waterloo, WI | +50 bps | $246 million |
| 31 | First Community Bank | Milton, WI | +50 bps | $159 million |
| 32 | Dmb Community Bank | Madison, WI | +50 bps | $835 million |
| 33 | The Park Bank | Madison, WI | +48 bps | $1.5 billion |
| 34 | Peoples State Bank | Prairie Du Chien, WI | +47 bps | $993 million |
| 35 | Clare Bank N.A. | Platteville, WI | +45 bps | $332 million |
| 36 | Waukesha State Bank | Waukesha, WI | +45 bps | $1.6 billion |
| 37 | Fox Valley Savings Bank | Fond Du Lac, WI | +45 bps | $387 million |
| 38 | State Bank Financial | La Crosse, WI | +44 bps | $512 million |
| 39 | Premierbank | Fort Atkinson, WI | +43 bps | $584 million |
| 40 | Crossbridge Community Bank | Tomahawk, WI | +43 bps | $217 million |
| 41 | Citizens State Bank | Cadott, WI | +43 bps | $238 million |
| 42 | Marathon Bank | Wausau, WI | +42 bps | $261 million |
| 43 | Bank First N.A. | Manitowoc, WI | +42 bps | $5.9 billion |
| 44 | Shell Lake State Bank | Shell Lake, WI | +41 bps | $362 million |
| 45 | Citizens State Bank - La Crosse | La Crosse, WI | +41 bps | $649 million |
| 46 | Waterstone Bank | Wauwatosa, WI | +41 bps | $2.3 billion |
| 47 | Citizens State Bank of Loyal | Loyal, WI | +40 bps | $312 million |
| 48 | Capitol Bank | Madison, WI | +40 bps | $565 million |
| 49 | Laona State Bank | Laona, WI | +40 bps | $297 million |
| 50 | Sterling Bank | Barron, WI | +39 bps | $352 million |
| 51 | West Pointe Bank | Oshkosh, WI | +39 bps | $369 million |
| 52 | Abbybank | Abbotsford, WI | +39 bps | $662 million |
| 53 | Wolf River Community Bank | Hortonville, WI | +38 bps | $386 million |
| 54 | Spring Bank | Brookfield, WI | +37 bps | $441 million |
| 55 | Security Financial Bank | Durand, WI | +37 bps | $1.0 billion |
| 56 | Bank of Cashton | Cashton, WI | +37 bps | $146 million |
| 57 | Coulee Bank | La Crosse, WI | +37 bps | $524 million |
| 58 | Dairy State Bank | Rice Lake, WI | +37 bps | $730 million |
| 59 | Peshtigo National Bank | Peshtigo, WI | +37 bps | $300 million |
| 60 | National Exchange Bank and Trust | Fond Du Lac, WI | +36 bps | $2.9 billion |
| 61 | Nicolet National Bank | Green Bay, WI | +36 bps | $15.4 billion |
| 62 | The Peoples Community Bank | Mazomanie, WI | +36 bps | $389 million |
| 63 | Collins State Bank | Collins, WI | +36 bps | $301 million |
| 64 | Peoples State Bank | Wausau, WI | +35 bps | $1.5 billion |
| 65 | Security Bank | New Auburn, WI | +35 bps | $254 million |
| 66 | Pillar Bank | Baldwin, WI | +33 bps | $267 million |
| 67 | The Equitable Bank, S.S.B. | Wauwatosa, WI | +32 bps | $327 million |
| 68 | Bonduel State Bank | Bonduel, WI | +32 bps | $132 million |
| 69 | National Bank of Commerce | Superior, WI | +31 bps | $2.2 billion |
| 70 | The Northwestern Bank | Chippewa Falls, WI | +31 bps | $726 million |
| 71 | Partners Bank | Marshfield, WI | +31 bps | $294 million |
| 72 | Citizens State Bank | Hudson, WI | +31 bps | $488 million |
| 73 | Associated Bank N.A. | Green Bay, WI | +30 bps | $51.8 billion |
| 74 | Waumandee State Bank | Waumandee, WI | +29 bps | $345 million |
| 75 | State Bank of Reeseville | Reeseville, WI | +29 bps | $170 million |
| 76 | The First National Bank of River Falls | River Falls, WI | +29 bps | $325 million |
| 77 | Cumberland Federal Bank FSB | Cumberland, WI | +29 bps | $342 million |
| 78 | Westbury Bank | Waukesha, WI | +28 bps | $772 million |
| 79 | Tri City National Bank | Oak Creek, WI | +28 bps | $2.0 billion |
| 80 | Greenleaf Bank | Greenleaf, WI | +27 bps | $159 million |
| 81 | Bank Cmg | Madison, WI | +27 bps | $1.1 billion |
| 82 | Woodford State Bank | Monroe, WI | +27 bps | $523 million |
| 83 | Forward Bank | Marshfield, WI | +27 bps | $1.3 billion |
| 84 | Richland County Bank | Richland Center, WI | +26 bps | $114 million |
| 85 | Oak Bank | Fitchburg, WI | +26 bps | $486 million |
| 86 | Premier Community Bank | Marion, WI | +26 bps | $552 million |
| 87 | East Wisconsin Savings Bank | Kaukauna, WI | +26 bps | $266 million |
| 88 | Lake Ridge Bank | Middleton, WI | +25 bps | $3.4 billion |
| 89 | State Bank of Newburg | Newburg, WI | +24 bps | $328 million |
| 90 | Community First Bank | Boscobel, WI | +23 bps | $634 million |
| 91 | Pyramax Bank, F.S.B. | Greenfield, WI | +22 bps | $589 million |
| 92 | Citizens Bank | Mukwonago, WI | +21 bps | $1.2 billion |
| 93 | Royal Bank | Elroy, WI | +20 bps | $816 million |
| 94 | Bank of Wisconsin Dells | Wisconsin Dells, WI | +20 bps | $1.1 billion |
| 95 | State Bank of Chilton | Chilton, WI | +20 bps | $517 million |
| 96 | North Shore Bank | Brookfield, WI | +20 bps | $2.6 billion |
| 97 | Cleveland State Bank | Cleveland, WI | +20 bps | $246 million |
| 98 | Community State Bank | Union Grove, WI | +20 bps | $667 million |
| 99 | Bay Bank | Green Bay, WI | +19 bps | $316 million |
| 100 | Waldo State Bank | Waldo, WI | +18 bps | $154 million |
Rankings sort one published measure; they are not an overall judgment of any institution. Methodology · All rankings