Cal. Fin. Code § 16154

A foreign (other state) credit union that maintains a California branch office or California facility, if required by the commissioner, shall make, keep, and preserve, at the branch office, facility, or at any other place that the commissioner may by regulation or order approve, the books, accounts, and other records relating to the business of the California branch office or California facility, in the form, in the manner, and for the time that the commissioner may by regulation or order require.