Zions Bancorporation (NASDAQ:ZION) has fallen 8% since the Federal Reserve announced that it was the only bank to fail the most recent round of stress tests, with a post-stress tier 1 capital ratio of 3.5% instead of the mandated minimum 5% (the average among all bank holding corporations was 7.6%). Zions Bancorporation may face heightened Fed scrutiny “Intensified regulatory scrutiny likely raises the bar for ZION’s planned capital plan resubmission,” write Sterne Agee analysts Todd L. Hagerman and Robert Greene in a March 25 report. “While the Fed seemingly took a punitive approach towards ZION’s risk profile, including potential credit…