ChainCatcher news, according to Golden Ten Data, a new crisis has emerged among regional banks in the United States, dragging down bank stock prices sharply. Zions Bancorp's stock price once fell by 15%, after the company disclosed that its wholly-owned subsidiary, California Bank & Trust in San Diego, had set aside a $50 million impairment charge for a loan it underwrote. Western Alliance Bancorp's stock price once dropped by 13%. Affected by this news, the KBW Bank Index in the US stock market closed down 3.6%.