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Condensed Consolidated Statements Of Stockholders' Equity (USD $)
In Thousands, except Share data
Common Stock [Member]
Capital Surplus [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Gain (Loss), Net [Member]
Total
Balance at Dec. 31, 2009$ 122,679$ 257,643$ 454,343$ 2,998$ 837,663
Balance, shares at Dec. 31, 200936,840,453    
Comprehensive income     
Net income per consolidated statements of income  35,187 35,187
Net change in unfunded accumulated benefit obligation, net of tax   1,1901,190
Net change in fair value of securities available for sale, net of tax   13,82913,829
Comprehensive income  35,18715,01950,206
Cash dividends declared ($0.72 per common share)  (26,770) (26,770)
Common stock issued, long-term incentive plan, including income tax benefit, shares42,981    
Common stock issued, long-term incentive plan, including income tax benefit1431,508  1,651
Compensation expense, long-term incentive plan 3,030  3,030
Balance at Sep. 30, 2010122,822262,181462,76018,017865,780
Balance, shares at Sep. 30, 201036,883,434    
Balance at Dec. 31, 2010122,855263,484470,828(619)856,548
Balance, shares at Dec. 31, 201036,893,276    
Comprehensive income     
Net income per consolidated statements of income  57,793 57,793
Net change in unfunded accumulated benefit obligation, net of tax   1,1481,148
Net change in fair value of securities available for sale, net of tax   33,64533,645
Comprehensive income  57,79334,79392,586
Cash dividends declared ($0.72 per common share)  (50,051) (50,051)
Common stock issued in stock offering, shares6,958,143    
Common stock issued in stock offering23,170190,824  213,994
Common stock issued in connection with Whitney acquisition, shares40,794,261    
Common stock issued in connection with Whitney acquisition135,8451,172,199  1,308,044
Common stock issued, long-term incentive plan, including income tax benefit, shares52,566    
Common stock issued, long-term incentive plan, including income tax benefit175535  710
Compensation expense, long-term incentive plan 4,831  4,831
Balance at Sep. 30, 2011$ 282,045$ 1,631,873$ 478,570$ 34,174$ 2,426,662
Balance, shares at Sep. 30, 201184,698,246