Whenever an agent of depository accepts securities pursuant to Section 53656 it may, with the authorization of the depository, place such securities for safekeeping with a Federal Reserve Bank or branch thereof or with any bank located in a city designated as a reserve city by the Board of Governors of the Federal Reserve System or with the Federal Home Loan Bank of San Francisco or with a trust company located in this state. Authority for such placement together with the names of the banks or, including the Federal Home Loan Bank of San Francisco, trust companies to be so used, shall be contained in the contract between the treasurer and the depository required in Section

53649.