Idaho Code § 43-117

The treasurer shall on his appointment execute and file with the secretary an official bond in such amount as may be fixed by the board of directors of the district, which shall not be less than $5000; and shall thereafter from time to time execute and file such further bonds as may be required by said board in amounts fixed by it, which amounts shall be of at least fifty per cent (50%) of the maximum probable amount of money in the treasurer’s hands at any one time. All such official bonds shall be executed by a lawfully qualified surety company.