LEH did not buy a bank...they own a non-debotor company called Lehman Brothers Bank, FSB. It was renamed Aurora Bank and has received added captial from the parent company LBHI.
LBHI is currently requesting court approval to put additional capital into the bank so that it has even greater ability to "weather" the recession.
If it has enough capital then Aurora Bank can sell brokered Certificates of Deposit to customers. Which increases the value of the bank as it gets past the issues we all know about...RE.