Traders work on the floor of the New York Stock Exchange during afternoon trading on October 14, 2025.Michael M. Santiago/Getty Images Regional bank stocks plunged late in the day on Thursday amid concerns about credit quality. Zions Bancorp and Western Alliance Bancorp sank after updates on their lending businesses. The drop comes as commentators raise concerns about credit quality amid recent high-profile bankruptcies. Regional bank shares were slammed on Thursday as investors fled the sector af ...