Except as provided in section 533.302, subsection 3, a credit union organized under this chapter, as a condition of maintaining its privilege of organization, shall acquire and maintain insurance to protect each shareholder and each depositor against loss of funds held on account by the credit union. The insurance shall be obtained from the national credit union administrator or from some other share guarantor or insurance plan approved by the Iowa commissioner of insurance and the superintendent, provided that each credit union shall acquire deposit insurance from the appropriate agency of the federal government.