Except as otherwise expressly limited, an insurer shall not have at any time any combination of investments in or loans upon the security of the obligations, property, and securities of any one person aggregating an amount exceeding ten per cent of the insurer’s assets. This section shall not apply to investments in, or loans upon the security of general obligations of the government of the United States or of any state of the United States, nor to investments in foreign securities pursuant to section 431:6-313(a), nor include policy loans made pursuant to § 431:6-314.