(a) A person may not do business as a savings bank in this state or maintain an office in this state for the purpose of doing business in this state unless the person is a:
(1) domestic savings bank;
(2) federal savings bank; or
(3) foreign savings bank that holds a certificate of authority issued under Subchapter I, Chapter 92, or Section 61, Chapter 61, General Laws, Acts of the 41st Legislature, 2nd Called Session, 1929 (Article 881a-60, Vernon's Texas Civil Statutes).
(b) Subsection (a) does not prohibit activity that is not considered to be transacting business in this state under Section B, Article 8.01, Texas Business Corporation Act.