Join our mailing list to receive OSB news on events, services and offers.
Join our Mailing List!

Security. Community. History.

Discover Your Banking Advantage.

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®

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!


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

Welcome to OSB


Important Announcement!

**Ottawa Savings Bank to Acquire Twin Oaks Savings Bank**

Twin Oaks to become part of the Ottawa Savings family.

As we announced on June 30th, Ottawa Savings Bank, the wholly-owned subsidiary of Ottawa Savings Bancorp, and Twin Oaks Savings Bank have agreed to a merger of Twin Oaks with and into Ottawa Savings. Twin Oaks’ branch offices will be operated as a division of Ottawa Savings, subject to applicable regulatory requirements.

The merger, unanimously approved by each institution’s Board of Directors, is currently expected to close in the fourth quarter of 2014. The transaction is subject to certain conditions, including approval by Twin Oaks’ members and the Ottawa Savings Bancorp’s stockholders, and by banking regulators.

Here are some Frequently Asked Questions (with Answers) about the merger.