Also, the Fed expanded swap lines with other central banks to enable other central banks to provide further dollar liquidity. This was what largely took place in the period from September 2008 to March 2009.
Partly this is a result of the need felt by many banks, particularly the regional ones, to reduce their reliance on the now much less profitable mortgage market. In this sense, it shows how competition slowly works its way through the system. I confess that it has taken longer than I expected, and longer than I hoped, but we are finally getting there.