An insurer may invest the insurer's funds in excess of minimum capital and surplus in a loan on the pledge of any mortgage, stock, bond, or other evidence of indebtedness acceptable as an investment under Sections 424.051, 424.053-424.071, and 424.074, if the current value of the mortgage, stock, bond, or other evidence of indebtedness is at least 25 percent more than the amount of the loan.
Tex. Ins. Code § 424.069