PacWest plummets 28% to resume sell-off after the regional bank says deposits fell 9.5% last week

• PacWest sank 28% Thursday after the regional lender reported a 9.5% drop in deposits last week. 
• The bulk of the deposit decline came after reports said PacWest was exploring strategic options. 
• "The news headlines increased our customers' fears of the safety of their deposits," the bank said. 

PacWest stock sank Thursday after the California-based lender said deposits fell last week, reviving concerns about the bank's future.