<ARTICLE> 9
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM SOUTHWEST
BANCORP'S QUARTERLY REPORT ON FORM 10-Q FOR THE QUARTER ENDED MARCH 31, 1998,
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               MAR-31-1998
<CASH>                                          20,805
<INT-BEARING-DEPOSITS>                           1,022
<FED-FUNDS-SOLD>                                     0
<TRADING-ASSETS>                                     0
<INVESTMENTS-HELD-FOR-SALE>                    101,820
<INVESTMENTS-CARRYING>                          86,395
<INVESTMENTS-MARKET>                            87,041
<LOANS>                                        753,965
<ALLOWANCE>                                      8,897
<TOTAL-ASSETS>                                 985,900
<DEPOSITS>                                     839,227
<SHORT-TERM>                                    42,825
<LIABILITIES-OTHER>                              9,047
<LONG-TERM>                                     25,013
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                        690
<COMMON>                                         3,791
<OTHER-SE>                                      65,307
<TOTAL-LIABILITIES-AND-EQUITY>                 985,900
<INTEREST-LOAN>                                 16,996
<INTEREST-INVEST>                                2,918
<INTEREST-OTHER>                                    33
<INTEREST-TOTAL>                                19,947
<INTEREST-DEPOSIT>                               9,651
<INTEREST-EXPENSE>                              10,638
<INTEREST-INCOME-NET>                            9,309
<LOAN-LOSSES>                                      825
<SECURITIES-GAINS>                                  17
<EXPENSE-OTHER>                                  6,452
<INCOME-PRETAX>                                  3,644
<INCOME-PRE-EXTRAORDINARY>                       3,644
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     2,333
<EPS-PRIMARY>                                     0.51
<EPS-DILUTED>                                     0.50
<YIELD-ACTUAL>                                    8.65
<LOANS-NON>                                      5,266
<LOANS-PAST>                                     1,645
<LOANS-TROUBLED>                                     0
<LOANS-PROBLEM>                                 27,916
<ALLOWANCE-OPEN>                                 8,282
<CHARGE-OFFS>                                      498
<RECOVERIES>                                       288
<ALLOWANCE-CLOSE>                                8,897
<ALLOWANCE-DOMESTIC>                             8,897
<ALLOWANCE-FOREIGN>                                  0
<ALLOWANCE-UNALLOCATED>                          1,417