No association of underwriters authorized hereunder to do business in this state shall expose themselves to loss on any one risk in excess of ten per cent of their net cash and invested assets and of the underwriting liability of the individual underwriters. So much, however, of any risk as shall be reinsured in an association of underwriters or insurance corporation lawfully transacting business in this state, shall not be considered part of the risk.
N.J.S. § 17:47-8