Commerce Bank Online Banking Commerce Bank started in 1856 as a subsidiary of Commerce Bancshares Inc., a bank holding company headquartered in Kansas City, Missouri. It is the oldest and largest bank in Kansas with branches spread over in Kansas, Colorado, Missouri, Oklahoma, and Illinois. Customer Service Telephone 1 (800) 453-2265 Online Banking Login How to Log In 1. Go to the bank webpage. 2. Enter your customer ID and click โ€œLog In.โ€ 3. Enter your password. How to Enroll…