** Shares of regional lender Associated Banc-Corp ASB.N fall as much as 1.2%; last down 0.6% at $25.89
** ASB will buy smaller rival American National in a $604 million all-stock deal, expanding into the Omaha market and strengthening its foothold in the Twin Cities and across the Midwest
** "We see the potential for modest underperformance as ASB loses any take-out premium assumed in the price," Stephens analyst Terry McEvoy says
** Two of 10 brokerages rate the stock "buy" and eight "hold"; median PT $29 - data compiled by LSEG
** As of last close, ASB up 9% YTD
(Reporting by Arasu Kannagi Basil in Bengaluru)
((ArasuKannagi.Basil@thomsonreuters.com))