Yohnus owns the blacksmith in Shilo Village. Inside of his blacksmith contains the closest furnace to a bank in all of RuneScape, which can only be accessed by paying 20 coins, unless the player has completed the Karamja Diary.
As of 26 January 2016, right-clicking Yohnus grants the player a coffer in which they can store coins, and the door to the furnace has been removed.