The major banks are deleveraging, reducing their debt to asset ratio.
They are worried that in the event or a run, they could go into Bear Stearns style meltdown, and that if Congress of the SEC start increasing margin requirements, that they will be caught flat-footed.
Additionally, the leverage that they retain is being moved to longer term loans, which insulates them from a panic, at the cost of higher interest rates.
We still have a way to go down as this all unwinds, but one consequence will be higher interest rates, as the availability of money decreases, and supply and demand drives the price higher.