The prohibition is not limited to National Banks and you are going to have to check State laws. For example in Texas - the Texas Finance Code states:
ยง 34.102. TRANSACTION IN BANK SHARES. (a) A state bank may not acquire a lien by pledge or otherwise on its own shares, or otherwise purchase or acquire title to its own shares, except:
(1) as necessary to avoid or minimize a loss on a loan or investment previously made in good faith; or
(2) as provided by Subsection (b).
(b) With the prior written approval of the banking commissioner or as permitted by rules adopted under this subtitle, a state bank may acquire title to its own shares and hold those shares as treasury stock. Treasury stock acquired under this subsection is not considered an equity investment.
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