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Consolidated Statements of Shareholders' Equity (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Preferred Stock
Common Stock
Surplus
Retained Earnings
Other Comprehensive Income (Loss)
Treasury Stock
Balance at Dec. 31, 2008 $ 1,257,297 $ 203,558 $ 95,499 $ 158,110 $ 1,016,004 $ 18,189 $ (234,063)
Balance (in shares) at Dec. 31, 2008     95,499,000        
Increase (decrease) in shareholders' equity              
Net Income 142,742       142,742    
Dividends:              
Cash ($.38, $.36 and $.34 per share for the year ended December 31, 2011, 2010 and 2009, respectively) (23,262)       (23,262)    
Preferred stock (5%) including discount accretion (11,010) 2,184     (13,194)    
Purchase of treasury stock (425,655, 408,888, 708,925 shares for the year ended December 31, 2011, 2010 and 2009, respectively) (9,346)           (9,346)
Exercise of stock options 2,705   212 2,493      
Exercise of stock options (in shares)     212,000        
Stock compensation expense recognized in earnings 655     655      
Other comprehensive income (loss), net of tax:              
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments 47,689         47,689  
Balance at Dec. 31, 2009 1,407,470 205,742 95,711 161,258 1,122,290 65,878 (243,409)
Balance (in shares) at Dec. 31, 2009     95,711,000        
Increase (decrease) in shareholders' equity              
Net Income 130,023       130,023    
Dividends:              
Cash ($.38, $.36 and $.34 per share for the year ended December 31, 2011, 2010 and 2009, respectively) (24,444)       (24,444)    
Preferred stock (5%) including discount accretion (10,800) 2,326     (13,126)    
Purchase of treasury stock (425,655, 408,888, 708,925 shares for the year ended December 31, 2011, 2010 and 2009, respectively) (6,949)           (6,949)
Exercise of stock options 484     484      
Stock compensation expense recognized in earnings 534     534      
Other comprehensive income (loss), net of tax:              
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments (37,101)         (37,101)  
Balance at Dec. 31, 2010 1,459,217 208,068 95,711 162,276 1,214,743 28,777 (250,358)
Balance (in shares) at Dec. 31, 2010     95,711,000        
Increase (decrease) in shareholders' equity              
Net Income 127,149       127,149    
Dividends:              
Cash ($.38, $.36 and $.34 per share for the year ended December 31, 2011, 2010 and 2009, respectively) (25,648)       (25,648)    
Preferred stock (5%) including discount accretion (10,800) 2,480     (13,280)    
Purchase of treasury stock (425,655, 408,888, 708,925 shares for the year ended December 31, 2011, 2010 and 2009, respectively) (6,435)           (6,435)
Exercise of stock options 113   9 104      
Exercise of stock options (in shares)     9,000        
Stock compensation expense recognized in earnings 387     387      
Other comprehensive income (loss), net of tax:              
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments 56,182         56,182  
Balance at Dec. 31, 2011 $ 1,600,165 $ 210,548 $ 95,720 $ 162,767 $ 1,302,964 $ 84,959 $ (256,793)
Balance (in shares) at Dec. 31, 2011     95,720,000