Great Southern Bancorp Inc. (GSBC) saw its stock plummet 7.60% during intraday trading on Thursday, as concerns over credit quality in the regional banking sector intensified. The sharp decline came in the wake of Zions Bancorp's announcement of a $50 million loan loss, which sent shockwaves through the industry.

The sell-off in Great Southern's stock was part of a broader decline among regional banks, with the SPDR S&P Regional Banking ETF falling 4.6%. Zions Bancorp's disclosure of a $60 million provision for credit losses, primarily due to two problematic commercial loans in California, sparked investor fears about potential credit issues across the sector.

Analysts have described the situation as another credit "cockroach" appearing in the market, echoing recent warnings from JPMorgan Chase CEO Jamie Dimon about deteriorating credit conditions. The news has prompted investors to reassess the risk profiles of regional banks, leading to significant stock price declines across the board.