CA Fin Code Section 16021

(a)

No foreign (other state) credit union shall establish or maintain a California branch office unless the commissioner shall have first approved its establishment and issued a license authorizing the foreign (other state) credit union to maintain the California branch office.

(b)

Notwithstanding subdivision (a), this article does not apply to any branch office or other office in this state of a foreign (other state) credit union that was established prior to January 1, 2001, in compliance with existing law.