You are NOT required to use days from the Sick Leave Bank. However, if you withdraw days from your Sick Leave Bank, any Sick Leave Bank days that extend beyond the STD benefit start date will be an offset to the STD benefit. You will not be paid from two different sources for your disability. Your disability payment from MetLife will begin after your pay from the Sick Leave Bank ends.
Additional FAQs can be found on the disability microsite at: https://www.metlife.com/info/stateoftn/disability/state/benefits/faq/