** U.S. regional bank's shares  TCBI.O  jump 9.2% to a
4-month high of $63.23 
    ** Set for their biggest one-day pct. gain in more than 6
yrs
    ** Company to combine with rival Independent Bank Group
 IBTX.O  for ~$3 bln 
    ** TCBI shareholders to receive 1.0311 IBTX shares for each
share they currently own, representing a 5.5% premium to TCBI's
Friday close  urn:newsml:reuters.com:*:nL4N28J2XT
    ** Shares of IBTX are up 3.7% to a year-high of $61.01
    ** TCBI and IBTX up ~24% and ~33% respectively, so far this
year

 (Reporting by C Nivedita and Abhishek Manikandan in Bengaluru)
 ((C.Nivedita@thomsonreuters.com))