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Security. Community. History.

Discover Your Banking Advantage.

Attention Twin Oaks Marseilles Customers. 

As On Tuesday, August 18th, The Drive-up lanes at the Marseilles facility will be closed temporarily so that repairs to our roof can be completed.

Our inside teller stations will be open for business all day.

We're sorry for any inconvenience this may cause.

At Ottawa Savings Bank we promise to provide you with service second to none. We have a rich history and a fresh approach to security so you can bank with confidence. We are your friends, your partner, your service provider -
We are your neighborhood bank.

Featured Services

GEN GOLD®

Gen Gold®

Save money on products and services you use everyday like groceries, prescriptions, dining, entertainment and much more!

Mobile Banking

With Mobile Banking you can check account balances, transfer money, and pay your bills right from the palm of your hand!

Mortgage Application

Ottawa Savings Bank makes it easy to apply for your mortgage online so you can quickly get the money you need!

E-Statements

Sign up for Online Banking and get easy, free, secure paperless statements delivered directly to your email inbox.

Welcome to OSB

To All of the wonderful customers of Ottawa Savings Bank and Twin Oaks Savings Bank.

We would like to thank you for your patience during our recent conversion!  We truly appreciate all of our customers.