Idaho Code § 26-1214
Any officer or employee of any bank who shall pay out the funds of any bank upon the check, order or draft of any individual, firm, corporation or association, which has not on deposit with such bank a sum equal to such check, order or draft shall be personally liable to it for the amount so paid, unless the drawer of such check, order or draft has previously arranged with the board of directors for credit sufficient to cover such amount. Provided, that the board of directors may ratify such overdraft and relieve such liability.
Whenever the overdrafts of the depositors of any bank doing business under this chapter are, in the opinion or judgment of the director of the department of finance, excessive or of long standing, he may require such bank to either collect or materially reduce the same or secure notes in lieu (of) thereof.
Idaho Code § 26-1214