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Learn More TAKE CONTROL OF YOUR DEBIT CARD WITH GSB CARD CONTROL • Quickly detect unauthorized activity on your debit card
• Turn your debit card off and on
• See your account balance
• Find nearby ATMs
• Submit travel notices
Financial Goals Our Wealth Management team can help! Learn More ARE YOU ACHIEVING YOUR FINANCIAL GOALS? Rewards Credit Card The credit card from the bank you know best. Learn More GREAT RATES. REWARDS. SECURITY. • Personal Service with Worldwide reach
• Better reward points
• Competitive Rates with Hometown Service
• More Security
This card is issued by TCM Bank, N.A. Subject to credit approval.
High Yield Savings Account
No Lengthy Requirements
Earn Higher than the National Average Savings Rate
A simple way to earn more! Open Account SIMPLY SAVINGS
COVID Financial Guide Valuable information for businesses and individuals Read More Here Financial Guide For Iowans Amid COVID-19

Grinnell State Bank Locations

814 4th Ave
Grinnell, IA 50112
(641)­ 236-­3174
Grinnell Hours
5601 Merle Hay Rd
Johnston, IA 50131
(515)­ 278-­6300
Johnston Hours
1101 Court Ave
Marengo, IA 52301
(319)­ 642-­5511
Marengo Hours
205 E Broadway St
Polk City, IA 50226
(515) 984-6211
Polk City Hours

Convenient Online & Mobile Banking

Check out all of our options that make banking fit into your life.


Get Started! Open your accounts in just 15 minutes.

Not sure what you need? Check out Simply Banking and open your accounts online or in person at any of our four locations.

  • Financial Advisors, Loan Officers & Insurance Agents working under the same roof.
  • Mastercard Debit Cards
  • No Monthly Fees on Debit Cards

Simply Switch

The best accounts bundled to make your banking experience simple.

Combine the smarter way to save with the convenience of the no minimum average balance checking with our Simply Savings and Simply Checking accounts.

Earn up to 25x More*

With Simply Savings, simply deposit your money and save up to 25x the *FDIC national average savings rate on up to $25,000. Enjoy high-yield savings without the term limits.

No Minimum Average Balance

With Simply Checking, dipping below your average account balance doesn’t result in enormous fees. With monthly service fees as low as $0.50 per month, you can enjoy your money your way.

Upgrade To Save On Fees

With Preferred Checking, you can wave (waive) monthly service fees goodbye by maintaining the Average Available (collected) Balance! Learn more about how to enjoy your money and make your accounts work for you. *Inactivity fees may still apply.

Simply Smarter Business

Simply Savings for business…don’t take it “personal”!

A savvy, high-yield business savings account that offers your business the ability to start earning a higher interest rate, up to 25x the FDIC national average, on your excess funds with an interest rate tiered based on your account balance. Learn More.


Invest The Way You Want. We Can Show You How.

Whether you’re new to investing, an experienced trader or somewhere in between, we offer investment choices with a experienced team of advisors who work together to work for you.

  • 24/7 Access to the Investment Platform
  • Performance Reviews at Request

With over 58 years of combined experience, our team can help you find investment options that best suit your needs and accomplish your financial goals.

Investment products are not FDIC insured, are not bank guaranteed, and may lose value.

Phone over Iowa

Real Humans Answer Your Calls

Imagine big bank products and services without those irritating automated phone prompts. We’re proud to offer customer service with the small-town touch. Talk to you soon!

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