Michigan called on Citibank to help repay about $3 billion the state owed to the federal government for expenses racked up during the deepest part of the recession. Like many states, Michigan had to manage soaring unemployment insurance costs and borrowed from the feds to help workers who had lost their jobs. Washington had given these loans on very advantageous terms, but like a teaser rate for a credit card, those are expiring and interest costs will soon jump for borrowers. So Michigan, like Texas and Idaho, has refinanced these payments.