When any part of the assets to be deposited in this State consists of mortgage-secured notes or bonds, or loans upon real property secured by mortgage, such mortgages shall be accompanied by a policy of mortgage insurance issued under the provisions of this code, or by evidence of title issued by a person designated or approved by the commissioner and either authorized by law or found by the commissioner to be competent to issue such evidence. Such evidence of title shall consist either of a full abstract of title, a full certificate of title, or a policy of title insurance, and shall be assigned and approved by, or under the direction of, the commissioner.
In any case where he ascertains that the expense thereof would not be unreasonable or such as to make the deposit impracticable, the commissioner may require a policy of title insurance or a guaranty that the abstract is correct and that it shows title to be in the proper party, issued by a corporation authorized to issue such policies or guaranties.