UnionBancorp ( UBCD) and Centrue Financial ( TRUE) have signed a definitive agreement to merge. Centrue stockholders will receive 1.2 shares of UnionBancorp for each of their shares, and the combined company will have 36 full-service banking offices with total assets of around $1.3 billion. The merged bank will use the Centrue name. The board will have 10 directors, with five coming from each company. Shares of UnionBancorp closed Friday at $20.10. Centrue was up $1.29, or 5.6%, to $24.20. CBOT Holdings ( BOT) said the Chicago Board of Trade's volume during the second quarter reached a record 208 million contracts, an increase of 13% from the same period a year ago. Volume for the second quarter averaged a record 3.3 million contracts a day, up 14% from last year. Shares of CBOT Holdings were higher by $2.41, or 2%, to $122. Cullen/Frost ( CFR) agreed to buy Summit Bancshares ( SBIT) in a deal worth about $363.5 million. Summit shareholders will receive either cash or Cullen/Frost stock worth $11.50 plus 0.2933 of a Cullen/Frost share. Each Summit share will be valued at around $28.31. Summit was lately gaining $5.77, or 27.2%, to $26.98, and Cullen/Frost was down $1.85, or 3.2%, to $55.45. Larry Woodrum, president and CEO of Bank of Nevada since its founding, is giving up his day-to-day management responsibilities to spend more time with his family. The bank's board said he will remain on the board as vice chairman. Robert Sarver, chairman and CEO of Western Alliance ( WAL), the parent company of Bank of Nevada, will succeed Woodrum and keep his current position at the holding company. Shares of Western Alliance were up 16 cents, or 0.5%, to $34.94. First Commonwealth Financial ( FCF) was higher after being upgraded by Keefe Bruyette to outperform from market-perform. Shares of First Commonwealth were up 14 cents, or 1.1%, to $12.84.