By Michael S. Derby (Reuters) -Overall U.S. household debt levels increased modestly in the third quarter as borrowing in some form of trouble stabilized and student loan woes increased, the New York Federal Reserve said on Wednesday. As part of its latest report on borrowing in the economy, the regional Fed bank said overall borrowing for the third quarter rose 1%, or $197 billion, from the second quarter, to $18.6 trillion. From a year ago, total borrowing was up $642 billion. Most categories of borrowing increased relative to the second quarter: Mortgage balances were up $137 billion to $13.1 trillion, credit card balances were up $24 billion to $1.23 trillion and student loans increased $15 billion to $1.65 trillion. Auto loan borrowing was stable, the New York Fed reported, at $1.66 t

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