It was also an "school tax and abandonment" bond. Several southern states had them, from $100 up to $1200. You'll see several couples crossing state lines to get married, it wasn't actually eloping. its because they wouldn't have to pay the bond, as they weren't residents.
Some states even had professional bondsmen, kinda like your corner neighborhood bailbondsmen today.
It was usually the wife's family, generally brother, who would serve as bondsman, because they were ensuring they would care for the children and wife in case of death or desertion of the husband.