BRIEF-Shizuoka Bank appoints new president and chairman
U.S. mortgage bonds hold gains after details on Fed balance sheet plan
NEW YORK, June 14 Prices on U.S. mortgage-backed securities clung to their earlier gains on Wednesday after the Federal Reserve signaled it planned to reduce its reinvestments in Treasuries and MBS later this year in a bid to shrink its $4.5 trillion balance sheet.