California Code, Financial Code - FIN § 1688

Notwithstanding Section 1684, a foreign (other state) bank that does not maintain offices in California may merge with or purchase the whole business unit of a foreign (other state) bank that already maintains one or more offices in California in accordance with Section 1684 pursuant to federal law and the law of the domicile of the surviving or purchasing bank. The surviving or purchasing bank may retain the offices established in this state by the disappearing or selling bank. Thereafter, the surviving or purchasing bank may establish and maintain additional offices as if it were the disappearing or selling bank.