Yes, they are sitting on too much cash. There was a WSJ article titled "CFOs Seek High Returns on Cash, but Banks May Be Slow to Raise Rates". The article says "That's due to the size of the cash piles sitting at banks - both from companies and consumers - and the loan-to-deposit ratio, which measures the amount of deposits being handed out as loans which has been hovering at decade lows around 60% in recent quarters".