A trust company or other financial institution with fiduciary powers may, in its fiduciary capacity, purchase bonds or other securities underwritten or otherwise distributed by the financial institution or by a syndicate which includes the financial institution or an affiliate of the financial institution, provided such purchase is otherwise prudent and not prohibited by the instrument governing the fiduciary relationship. The provisions of this section shall apply to purchases of bonds or other securities made at the time of the initial offering thereof or at any time thereafter.