On Wednesday in Baltimore, the bankruptcy trustee overseeing the liquidation of Thornburg Mortgage Inc. will ask Judge Duncan W. Keir to sign off on the sale of the lender’s $11 billion mortgage-servicing portfolio. Select Portfolio Servicing Inc., a Salt Lake City mortgage-servicing business owned by Credit Suisse Group (CS), won the auction for Thornburg’s portfolio with a winning bid of about $95 million, according to Joel Sher, the failed lender’s Chapter 11 trustee. Thornburg, once the nation’s second-largest independent mortgage company, filed for bankruptcy protection in May 2009 to sell off its assets and go out of business.