Skip to main content

Profitability · South Dakota

US Banks with Highest Net Interest Margin (NIM) in South Dakota

Ranked among banks headquartered in South Dakota. Re-ranked 1-43 within the state from the same national ranking population.

#1 Net Interest Margin (NIM): 1ST FINANCIAL BANK USA — 9.37% . Net Interest Margin (NIM) measures the spread between interest earned on assets and interest paid on liabilities — the core unit economics of a commercial bank.

Ranked: 43 banks with reported data Showing: Top 43 Source: FFIEC call reports (Q1 2026) What is this metric? See the US Banks with … glossary entry Go deeper: What Is Net Interest Margin? A Bank Profitability Guide
# Bank HQ US Banks with … Total Assets
1 1st Financial Bank USA Dakota Dunes , SD 9.37% $1.33B
2 First Savings Bank Beresford , SD 7.76% $1.59B
3 First National Bank Oldham , SD 7.62% $484.3M
4 First National Bank Fort Pierre , SD 7.17% $2.05B
5 Pathward, N.A. Sioux Falls , SD 6.58% $7.11B
6 Bancorp Bank N.A., the Sioux Falls , SD 5.38% $9.90B
7 Heartland State Bank Redfield , SD 5.11% $156.0M
8 Quoin Financial Bank Miller , SD 4.86% $244.8M
9 Farmers and Merchants State Bank Plankinton , SD 4.76% $172.9M
10 Campbell County Bank Herreid , SD 4.57% $247.1M
Full financials, 24-year trends & peer benchmarks on every institution — free. Start free →
11 Commercial State Bank of Wagner Wagner , SD 4.49% $263.0M
12 Merchants State Bank Freeman , SD 4.48% $217.6M
13 First Fidelity Bank Burke , SD 4.44% $702.2M
14 Great Plains Bank Eureka , SD 4.34% $151.3M
15 Sunrise Banks, N.A. Sioux Falls , SD 4.29% $2.73B
16 Dacotah Bank Aberdeen , SD 4.01% $4.87B
17 Rivers Edge Bank Marion , SD 3.98% $346.3M
18 Pioneer Bank & Trust Belle Fourche , SD 3.87% $985.9M
19 Bankwest, Incorporated Pierre , SD 3.81% $1.92B
20 First Dakota National Bank Yankton , SD 3.79% $3.30B
21 Bankstar Financial Elkton , SD 3.76% $357.8M
22 U.S. Bank Trust N.A. Sd Sioux Falls , SD 3.76% $189.9M
23 American Bank & Trust Sioux Falls , SD 3.72% $2.24B
24 Black Hills Community Bank, N.A. Rapid City , SD 3.70% $495.9M
25 Cortrust Bank N.A. Mitchell , SD 3.66% $1.58B
26 First Bank & Trust Brookings , SD 3.63% $4.87B
27 Security Bank Midwest Tyndall , SD 3.54% $321.9M
28 First National Bank in Philip Philip , SD 3.51% $465.7M
29 Plains Commerce Bank Sioux Falls , SD 3.51% $1.35B
30 Anchorage Digital Bank N.A. Sioux Falls , SD 3.51% $1.14B
31 First Premier Bank Sioux Falls , SD 3.49% $3.55B
32 First State Bank of Roscoe Roscoe , SD 3.42% $152.3M
33 First National Bank in Sioux Falls, the Sioux Falls , SD 3.35% $2.11B
34 Security Savings Bank Canton , SD 3.30% $549.6M
35 Reliabank Dakota Estelline , SD 3.23% $757.8M
36 Dnb National Bank Clear Lake , SD 3.19% $119.6M
37 Farmers State Bank Parkston , SD 3.09% $258.9M
38 Wells Fargo Bank, N.A. Sioux Falls , SD 3.09% $1.85T
39 Frontier Bank Sioux Falls , SD 3.01% $344.8M
40 Security National Bank of South Dakota Dakota Dunes , SD 2.93% $253.2M
41 Citibank, N.A. Sioux Falls , SD 2.91% $1.93T
42 Citizens State Bank of Arlington Arlington , SD 2.81% $155.1M
43 One American Bank Centerville , SD 0.90% $360.3M

More Profitability rankings

Go past the leaderboard — open any bank for its full financials, 24-year trends, and peer percentiles. Free, no card required.

Start free — no card required

All data sourced from the most recent FFIEC call report filings, refreshed each quarter as new filings are processed. This leaderboard excludes banks with total assets under $100,000K to filter out anomalous micro-bank ratios. See /data-updates/ for the current data freshness window.

Explore more: all rankings · glossary · browse all banks