PacWest falls 17% as the California bank borrows cash following a 20% drop in deposits

• PacWest shares dropped 17% on Wednesday following a financial update. 
• The lender said deposits have fallen 20% since the end of last year. Venture banking deposits have declined. 
• Regional banks have been shaken by deposit outflows since SVB's collapse this month. 

PacWest shares tumbled Wednesday after the bank's update showed deposits have dropped by a fifth, leading the lender to obtain credit lines during an unsettling period of outflows from regional banks since the fall of Silicon Valley Bank this month.