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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2011
Income Taxes 
Summary Of Differences In Taxes From Continuing Operations
    Three Months Ended     Nine Months Ended  
    September 30,     September 30,  
(dollars in thousands)   2011     2010     2011     2010  
Provision at statutory rate of 35% $ 8,695   $ 4,776   $ 24,058   $ 13,185  
Tax-exempt income   (2,421 )   (2,416 )   (7,182 )   (7,749 )
Reversal of portion of unrecognized tax benefits   (623 )   (652 )   (623 )   (652 )
State income taxes   1,196     228     2,292     475  
Interim period effective rate adjustment   888     0     89     0  
Other, net   310     (187 )   (144 )   (77 )
Income tax expense $ 8,045   $ 1,749   $ 18,490   $ 5,182  
Effective tax rate   32.4  %   12.8 %   26.9 %   13.8 %
Summary Of Reconciliation Of Unrecognized Tax Benefits
(dollars in thousands)   2011     2010  
Balance at January 1 $ 4,553   $ 8,500  
Additions (reductions) based on tax positions related to the current year   4     (3,348 )
Reductions due to statute of limitations expiring   (413 )   (601 )
Balance at September 30 $ 4,144   $ 4,551