Maryland laws limiting prepayment penalties on adjustable-rate mortgages are preempted for operating subsidiaries of a national bank, according to the U.S. Court of Appeals for the 4th Circuit. In National City Bank of Indiana v. Turnbaugh, the bank and its operating subsidiaries National City Mortgage and First Franklin Financial Corp. sued in federal district court to prevent Maryland Commissioner of Financial Regulation Charles Turnbaugh from exercising his authority and enforcing state prepayment restrictions...