This blog is updated and maintained by Great Plains National Bank. Great Plains Bank has 21 locations in Oklahoma and Texas communities. The bank also has a full-service mortgage operation, with loan production offices in Oklahoma and Texas. Great Plains Bank is committed to providing a level of service that separates itself from their competition. Great Plains Bank is a subsidiary of Great Plains Bankshares Inc. Great Plains National Bank is FDIC insured and an Equal Opportunity Lender.