California Code, Financial Code - FIN § 1403

No bank, directly or indirectly, by any device whatever, shall pay any interest on any demand deposit except to the extent that the payment of interest on demand deposits is permitted to member banks of the Federal Reserve System or to banks whose deposits are insured by the Federal Deposit Insurance Corporation or any successor federal agency insuring bank deposits.  This section shall not apply to any deposit which is payable only at an office of the bank located outside of the states of the United States and the District of Columbia.