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Accumulated Other Comprehensive Income (Loss) (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reclassifications out of accumulated other comprehensive income, net of tax      
Interest expense $ (13,002) $ (11,094) $ (20,266)
Reclassification adjustment for actuarial losses included in salaries and employee benefits 482 471 45
Provision for income taxes (25,355) (15,128) (10,762)
Net income available to common shareholders 47,865 30,032 22,595
Amount Reclassified from Accumulated Other Comprehensive Income
     
Reclassifications out of accumulated other comprehensive income, net of tax      
Net income available to common shareholders 508    
Gains and losses on cash flow hedges | Amount Reclassified from Accumulated Other Comprehensive Income | Interest rate contracts
     
Reclassifications out of accumulated other comprehensive income, net of tax      
Interest expense 307    
Provision for income taxes (117)    
Net income available to common shareholders 190    
Amortization of defined benefit pension items | Amount Reclassified from Accumulated Other Comprehensive Income
     
Reclassifications out of accumulated other comprehensive income, net of tax      
Reclassification adjustment for actuarial losses included in salaries and employee benefits 482    
Provision for income taxes (164)    
Net income available to common shareholders $ 318