I am with Communication Federal Credit Union and am really happy with them, was with Tinker FCU for years until they lost sight of how to treat a customer.
I'm a member of Tinker Federal Credit Union, but I got in before the big banks whined to the Feds and got them to clamp down on the CU membership eligibility requirements (because, you know, the CUs were such a threat to the banks, what with single banks being bigger than all CUs combined, and all ). Looks like they have at least one branch in Tulsa.
TFCU Membership Eligibility: https://www.tinkerfcu.org/index.php/membership/joining-tfcu/
I know several people who are members of the Weokie and Communications Federal credit unions, and they seem to be happy with them, but I've never dealt with those CUs.
I find the with the credit union it's easier to borrow money from than a bank. But then I get better service handling my account and bill pay with the bank.
Tulsa Teachers isn't bad and they have enough locations to be convenient. Even though my accounts are with them, I normally get my loans through Red Crown as their rates are typically better.