The franchise of a national banking association as a national banking association shall automatically terminate when its conversion into or its merger or consolidation with a State bank under a State charter is consummated and the resulting State bank shall be considered the same business and corporate entity as the national banking association , although as to rights, powers, and duties the resulting bank is a State bank. Any reference to such national banking association in any contract, will, or document shall be considered a reference to the State bank if not inconsistent with the provisions of the contract, will, or document or applicable law. (Aug. 17, 1950, ch. 729, § 3, 64 Stat. 456 .)