Compared with preceding third quarter, fourth quarter 2012 net interest margin declined 18 basis points, largely reflecting decreases in the weighted average yields on loans and investment securities. Excluding the effect of acquisition accounting, the core net interest margin for fourth quarter 2012 declined only 8 basis points from third quarter 2012.

The weighted average yield on loans and the impact of acquisition accounting adjustments are summarized in the following table:
        Three Months Ended  
12/31/2012   12/31/2011   change   9/30/2012   change
The weighted average yield on loans, excluding effect of acquisition accounting adjustments 5.24 % 5.87 % (0.63 ) % 5.39 % (0.15 ) %
Acquisition accounting adjustments 0.65   0.43   0.22   0.72 (0.07 )
Reported weighted average yield on loans 5.89 % 6.30 % (0.41 ) % 6.11 % (0.22 ) %
 

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