<TABLE> <S> <C>

<PAGE>
<ARTICLE> 9
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED FINANCIAL STATEMENTS OF SIERRAWEST BANCORP AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               DEC-31-1997
<CASH>                                          58,345
<INT-BEARING-DEPOSITS>                               0
<FED-FUNDS-SOLD>                                22,275
<TRADING-ASSETS>                                     0
<INVESTMENTS-HELD-FOR-SALE>                    107,309
<INVESTMENTS-CARRYING>                           1,000
<INVESTMENTS-MARKET>                             1,000
<LOANS>                                        553,713
<ALLOWANCE>                                      7,891
<TOTAL-ASSETS>                                 786,746
<DEPOSITS>                                     701,001
<SHORT-TERM>                                         0
<LIABILITIES-OTHER>                             10,946
<LONG-TERM>                                      5,416
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        42,148
<OTHER-SE>                                      27,235
<TOTAL-LIABILITIES-AND-EQUITY>                 786,746
<INTEREST-LOAN>                                 50,383
<INTEREST-INVEST>                                6,040
<INTEREST-OTHER>                                 2,004
<INTEREST-TOTAL>                                58,565
<INTEREST-DEPOSIT>                              22,497
<INTEREST-EXPENSE>                              23,221  <F1>
<INTEREST-INCOME-NET>                           35,344
<LOAN-LOSSES>                                    2,799
<SECURITIES-GAINS>                                  50
<EXPENSE-OTHER>                                 31,610
<INCOME-PRETAX>                                 14,621
<INCOME-PRE-EXTRAORDINARY>                       8,948
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     8,948
<EPS-PRIMARY>                                     1.96
<EPS-DILUTED>                                     1.73
<YIELD-ACTUAL>                                    5.52
<LOANS-NON>                                      6,949
<LOANS-PAST>                                     1,576
<LOANS-TROUBLED>                                 1,922
<LOANS-PROBLEM>                                  1,304
<ALLOWANCE-OPEN>                                 5,647
<CHARGE-OFFS>                                    1,714
<RECOVERIES>                                       295
<ALLOWANCE-CLOSE>                                7,891
<ALLOWANCE-DOMESTIC>                             7,891
<ALLOWANCE-FOREIGN>                                  0
<ALLOWANCE-UNALLOCATED>                              0
<FN>
<F1>AMENDED TO CORRECT CLERICAL ERROR ON RESTATED SCHEDULE LINE ITEM "INTEREST-
EXPENSE FILED 9/3/98 ON FORM 10-Q/A. ORIGINAL AMOUNT $724-
CORRECTED AMOUNT $23,221.
</FN>
        

</TABLE>