(a) Each member of a domestic mutual insurer shall, except as otherwise provided in this chapter with respect to nonassessable policies, have a contingent liability, pro rata and not one for another, for the discharge of its obligations, which contingent liability shall be expressed in the policy and be in such maximum amount as is specified in the insurer's articles of incorporation.
(b) Termination of the policy of any such member shall not relieve the member of contingent liability for his proportion, if any, of the obligations of the insurer which accrued while the policy was in force.
(c) Unrealized contingent liability of members does not constitute an asset of the insurer in any determination of its financial condition.