ST. LOUIS St. Louis-based Boatmen's Bancshares said it has agreed to purchase two Oklahoma banks for an unspecified amount of cash.

The two banks, Security Bank in Tulsa and First Bank of Catoosa, will be merged into Boatmen's First National Bank of Oklahoma.

The sale is subject to regulatory approval and is expected to be completed by the end of this year.

Security Bank has assets of about $170 million and First Bank of Catoosa's assets exceed $70 million.

Boatmen's said that when the acquisitions are completed, total assets of Boatmen's Oklahoma bank will be more than $1.4 billion.

Boatmen's Bancshares has assets of about $19 billion. It is the nation's 34th largest bank-holding company, with more than 300 locations in Missouri, Illinois, Tennessee, Oklahoma, Arkansas and Iowa.