California Code, Financial Code - FIN § 1463

A commercial bank may hypothecate its assets in any manner provided by law to secure the deposits of moneys of the United States, of postal savings funds, of estates in bankruptcy cases, of the State of California, or of any political subdivision, public corporation, or district of the State of California. With the prior approval of the commissioner a bank may hypothecate its assets to secure moneys payable to other states.