Idaho Code § 11-726: LIABILITY OF GARNISHEE ON NEGOTIABLE PAPER.

The garnishee shall not be held liable on any debt due upon negotiable paper unless such paper is delivered up to him, or he is fully exonerated or indemnified against any liability thereon after he may have satisfied the judgment. But if it shall be made to appear to the satisfaction of the court in which the proceedings are pending, that the paper is in the possession or control of the judgment debtor, he may be compelled to produce it by attachment.