A mutual company incorporated by this or any other state may also issue policies insuring property and risks in this state without the contingent mutual liability of the policyholders for assessment; provided, that it shall have at all times net assets over all liabilities of not less than one hundred thousand dollars ($100,000) and, if incorporated by this state, shall maintain a deposit with the general treasurer for the benefit and protection of all of its policyholders of at least one hundred thousand dollars ($100,000), or, if incorporated by any other state, it shall maintain that deposit in its home state, which deposit in each case shall be in cash or securities that are legal investments by that company in its home state.