RANKING ·
Lowest efficiency ratio in South Dakota
44 of 58 banks in South Dakota that filed for the quarter ended June 30, 2026 are ranked. At least $100 million in total assets and positive revenue. Institutions with equal values share a rank. Source: FDIC quarterly financial data.
| Rank | Institution | Headquarters | Efficiency ratio (noninterest expense / revenue) | Total assets |
|---|---|---|---|---|
| 1 | U.S. Bank Trust National Association Sd | Sioux Falls, SD | 17.9% | $192 million |
| 2 | Farmers and Merchants State Bank | Plankinton, SD | 37.5% | $180 million |
| 3 | First National Bank in Philip | Philip, SD | 38.2% | $458 million |
| 4 | First Savings Bank | Beresford, SD | 41.5% | $1.6 billion |
| 5 | The Bancorp Bank National Association | Sioux Falls, SD | 41.6% | $9.2 billion |
| 6 | Security National Bank of South Dakota | Dakota Dunes, SD | 44.0% | $251 million |
| 7 | Commercial State Bank of Wagner | Wagner, SD | 44.0% | $260 million |
| 8 | First National Bank | Fort Pierre, SD | 45.2% | $2.0 billion |
| 9 | First National Bank | Oldham, SD | 46.7% | $478 million |
| 10 | Campbell County Bank | Herreid, SD | 46.9% | $241 million |
| 11 | Merchants State Bank | Freeman, SD | 48.0% | $220 million |
| 12 | Pioneer Bank & Trust | Belle Fourche, SD | 49.0% | $1.0 billion |
| 13 | First State Bank of Roscoe | Roscoe, SD | 49.2% | $147 million |
| 14 | Bankstar Financial | Elkton, SD | 50.6% | $363 million |
| 15 | Heartland State Bank | Redfield, SD | 50.9% | $154 million |
| 16 | American Bank & Trust | Sioux Falls, SD | 51.6% | $2.2 billion |
| 17 | First Dakota National Bank | Yankton, SD | 51.7% | $3.4 billion |
| 18 | Citibank N.A. | Sioux Falls, SD | 52.2% | $2.0 trillion |
| 19 | Wells Fargo Bank N.A. | Sioux Falls, SD | 53.1% | $1.9 trillion |
| 20 | Black Hills Community Bank N.A. | Rapid City, SD | 54.6% | $490 million |
| 21 | Rivers Edge Bank | Marion, SD | 54.7% | $357 million |
| 22 | First Fidelity Bank | Burke, SD | 55.9% | $717 million |
| 23 | Dnb National Bank | Clear Lake, SD | 56.1% | $124 million |
| 24 | Reliabank Dakota | Estelline, SD | 56.4% | $788 million |
| 25 | First Premier Bank | Sioux Falls, SD | 57.4% | $3.6 billion |
| 26 | Citizens State Bank of Arlington | Arlington, SD | 57.6% | $153 million |
| 27 | First Bank & Trust | Brookings, SD | 58.5% | $4.8 billion |
| 28 | Dacotah Bank | Aberdeen, SD | 61.0% | $4.9 billion |
| 29 | The First National Bank in Sioux Falls | Sioux Falls, SD | 61.6% | $2.1 billion |
| 30 | Farmers State Bank | Parkston, SD | 63.1% | $255 million |
| 31 | Anchorage Digital Bank N.A. | Sioux Falls, SD | 63.8% | $1.9 billion |
| 32 | Great Plains Bank | Eureka, SD | 65.8% | $150 million |
| 33 | Quoin Financial Bank | Miller, SD | 66.2% | $251 million |
| 34 | Pathward N.A. | Sioux Falls, SD | 67.9% | $7.3 billion |
| 35 | Security Savings Bank | Canton, SD | 71.4% | $557 million |
| 36 | 1st Financial Bank USA | Dakota Dunes, SD | 73.8% | $1.4 billion |
| 37 | Frontier Bank | Sioux Falls, SD | 78.5% | $349 million |
| 38 | Cortrust Bank N.A. | Mitchell, SD | 78.7% | $1.6 billion |
| 39 | Security State Bank | Alexandria, SD | 79.0% | $103 million |
| 40 | Bankwest, Incorporated | Pierre, SD | 80.9% | $1.9 billion |
| 41 | Security Bank Midwest | Tyndall, SD | 81.6% | $304 million |
| 42 | One American Bank | Centerville, SD | 84.9% | $285 million |
| 43 | Plains Commerce Bank | Sioux Falls, SD | 85.8% | $1.3 billion |
| 44 | Sunrise Banks N.A. | Sioux Falls, SD | 88.3% | $2.8 billion |
Rankings sort one published measure; they are not an overall judgment of any institution. Methodology · All rankings