521B.3  Reduction from liability for reinsurance ceded by a domestic insurer to an assuming insurer.
  A reduction from liability for the reinsurance ceded by a domestic insurer to an assuming insurer not meeting the requirements of section 521B.2 is allowed in an amount not exceeding the liabilities carried by the ceding insurer and the reduction shall be in the amount of funds held by or on behalf of the ceding insurer, including funds held in trust for the ceding insurer, under a reinsurance contract with the assuming insurer as security for the payment of obligations under the reinsurance contract, if such security is held in the United States subject to withdrawal solely by, and under the exclusive control of, the ceding insurer, or in the case of a trust, held in a qualified United States financial institution, as defined in section 521B.4, subsection 2. This security may be held in the form of any of the following:
  1.  Cash.
  2.  Securities listed by the securities valuation office of the national association of insurance commissioners and qualifying as admitted assets.
  3.  Clean, irrevocable, unconditional letters of credit, issued or confirmed by a qualified United States financial institution, as defined in section 521B.4, subsection 2, no later than December 31 of the year for which filing is being made, and in the possession of the ceding insurer on or before the filing date of its annual statement.
  Letters of credit meeting applicable standards of issuer acceptability as of the dates of their issuance or confirmation shall, notwithstanding the subsequent failure of the issuing or confirming institution or subsequent failure to meet applicable standards of issuer acceptability, continue to be acceptable as security until their expiration, extension, renewal, modification, or amendment, whichever first occurs.
  4.  Any other form of security acceptable to the commissioner.
91 Acts, ch 26, §16