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Income Taxes (Tables)
3 Months Ended
Jun. 30, 2012
Income Taxes [Abstract]  
Summary Of Differences In Taxes From Continuing Operations
    Three Months Ended     Six Months Ended  
    June 30,     June 30,  
(dollars in thousands)   2012     2011     2012     2011  
Provision at statutory rate of 35% $ 13,333   $ 8,030   $ 23,855   $ 15,363  
Tax-exempt income   (2,636 )   (2,370 )   (5,146 )   (4,761 )
State income taxes   1,133     702     2,027     1,096  
Interim period effective rate adjustment   (723 )   (3 )   (706 )   (799 )
Other, net   (218 )   (432 )   (801 )   (454 )
Income tax expense $ 10,889   $ 5,927   $ 19,229   $ 10,445  
Effective tax rate   28.6 %   25.8 %   28.2 %   23.8 %
Summary Of Reconciliation Of Unrecognized Tax Benefits
(dollars in thousands)   2012   2011
Balance at January 1 $ 4,145 $ 4,553
Additions (reductions) based on tax positions related to the current year   1   3
Balance at June 30 $ 4,146 $ 4,556