It does not have to be posted on the door. See 12 CFR 328.4. Keep your eyes open for an amendment to this when the FDIC issues regulations regarding the use of new logos as a result of the merger of the BIF and SAIF into the DIF.
There is no timetable as to when the regulations will be changed.
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Opinions expressed are my own and not necessarily those of my employer. They are not legal advice.