A banker's bank may be chartered pursuant to Sections 301 through 313 of Title 6 of the Oklahoma Statutes and shall have the powers set forth in Section 402 of Title 6 of the Oklahoma Statutes, subject to the following limitations and restrictions:
1. The stock of the bank shall be owned exclusively by other banks, or if the stock of such bank is owned by a holding company, then the stock of the holding company is owned exclusively by other banks;
2. The bank or the bank holding company owning such bank, including all subsidiaries, shall engage primarily in providing service to or for other depository institutions or their holding companies, and the directors, officers, or employees of such institutions;
3. The bank shall have federal deposit insurance by the Federal Deposit Insurance Corporation; and 4. The bank shall provide correspondent banking services at the request of other depository institutions, their subsidiaries or their holding companies and subsidiaries of such holding companies.