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Profitability · Idaho

US Banks with Highest Net Interest Margin (NIM) in Idaho

Ranked among banks headquartered in Idaho. Re-ranked 1-11 within the state from the same national ranking population.

#1 Net Interest Margin (NIM): TWIN RIVER BANK — 5.33% . 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: 11 banks with reported data Showing: Top 11 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 Twin River Bank Lewiston , ID 5.33% $172.6M
2 Bank of Commerce, the Idaho Falls , ID 4.54% $2.26B
3 Northwest Bank Boise , ID 4.43% $1.46B
4 Bankcda Coeur D'Alene , ID 4.37% $232.8M
5 Bank of Idaho Idaho Falls , ID 4.29% $1.30B
6 Idaho Trust Bank Boise , ID 4.18% $232.6M
7 Ireland Bank Malad City , ID 4.17% $361.7M
8 Farmers Bank Buhl , ID 4.00% $664.8M
9 First Federal Savings Bank of Twin Falls Twin Falls , ID 3.74% $1.44B
10 D.L. Evans Bank Burley , ID 3.28% $3.66B
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11 Idaho First Bank Mccall , ID 3.14% $1.37B

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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.

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