In addition to laws otherwise applicable, mortgage guaranty insurers are subject to the following limitations:(1) No such insurer may retain risk as to any one subject of insurance in any amount exceeding 10 percent of its surplus as to policyholders. In determining the amount of risk retained, applicable reinsurance in any assuming insurer authorized to transact insurance in this state or approved by the office shall be deducted from the total direct risk insured.
(2) Mortgage guaranty insurance may be written with respect to real estate loans only on those loans which a bank, a savings and loan association, or an insurance company regulated by this state or an agency of the Federal Government is authorized to make.