Idaho Code § 68-404
Executors, administrators, guardians, trustees and other fiduciaries of every kind and nature, land and building corporations, building and loan associations, savings and loan associations and other savings or investment institutions, trust companies, banks and insurance companies, incorporated under the laws of this state, are authorized, in addition to investments now authorized by laws of this state, to invest in bonds and other obligations of, or guaranteed as to interest and principal by, the United States, either directly or through securities of or other interests in any unincorporated investment company or investment trust registered under the federal investment company act of 1940, as from time to time amended, provided that the portfolio of such investment company or investment trust is limited to obligations of the United States government and its agencies and instrumentalities, the payment of which is fully guaranteed as to principal and interest by the United States government, and to repurchase agreements fully collateralized by any such obligations, provided that such investment company or investment trust takes delivery of such collateral either directly or through an authorized custodian; bonds or debentures issued by any federal home loan bank in accordance with the provisions of the Federal Home Loan Bank Act, and amendments thereto; consolidated federal home loan bank bonds or debentures issued by the federal home loan bank board in accordance with the provisions of the Federal Home Loan Bank Act, and amendments thereto; bonds or debentures issued by the Federal Savings and Loan Insurance Corporation in accordance with the provisions of title IV of the National Housing Act, and amendments thereto; shares or accounts of land and building corporations, savings and loan associations, building and loan associations, and other savings or investment institutions, incorporated under the laws of this state, which have been insured by the Federal Savings and Loan Insurance Corporation; and shares or accounts of federal savings and loan associations incorporated under the provisions of Home Owners' Loan Act of 1933, and amendments thereto, doing business in this state, which have been insured by the Federal Savings and Loan Insurance Corporation.
Idaho Code § 68-404