“Now the rest of the acts of King Jeroboam, and all that he did, and his might, how he fought, and how he recovered Damascus and Hamath for Israel, which had belonged to Judah, are they not written in the Book of the Annals of the Kings of Israel? King Jeroboam slept with his ancestors, the kings of Israel. His son King Zechariah succeeded him.”
As usual if you want more information the lost “Book of the Annals of the Kings of Israel” will help you. This seems to be a very short summary of 41 years of a long and prosperous reign, when other kings got more attention. Somehow he had control of Damascus, which means that he must have conquered the Arameans. He also had the lands of the east bank, but we do not know how he got them back. Finally he took land from Judah, like his father. He was succeeded by his son King Zechariah.