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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, 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 ($.43, $.40 and $.38 per share for the year ended December 31, 2013, 2012 and 2011, respectively) (25,648)       (25,648)    
Preferred stock (5%) including discount accretion (10,800) 2,480     (13,280)    
Purchase of treasury stock (95,466 and 425,655 shares for the year ended December 31, 2012 and 2011, respectively) (6,435)           (6,435)
Exercise of stock options 113   9 104      
Exercise of stock options (in shares)     9,000        
Stock compensation expense recognized in earnings 387     387      
Other comprehensive income (loss), net of tax:              
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments 56,182         56,182  
Balance at Dec. 31, 2011 1,600,165 210,548 95,720 162,767 1,302,964 84,959 (256,793)
Balance (in shares) at Dec. 31, 2011     95,720,000        
Increase (decrease) in shareholders' equity              
Net Income 107,835       107,835    
Dividends:              
Cash ($.43, $.40 and $.38 per share for the year ended December 31, 2013, 2012 and 2011, respectively) (26,894)       (26,894)    
Preferred stock (5%) including discount accretion (8,910) 5,452     (14,362)    
Redemption of Series A Preferred Shares (216,000 shares for the year ended December 31, 2012) (216,000) (216,000)          
Purchase of treasury stock (95,466 and 425,655 shares for the year ended December 31, 2012 and 2011, respectively) (1,716)           (1,716)
Exercise of stock options 51   5 46      
Exercise of stock options (in shares)     5,000        
Stock compensation expense recognized in earnings 474     474      
Other comprehensive income (loss), net of tax:              
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments (19,297)         (19,297)  
Balance at Dec. 31, 2012 1,435,708   95,725 163,287 1,369,543 65,662 (258,509)
Balance (in shares) at Dec. 31, 2012     95,725,000        
Increase (decrease) in shareholders' equity              
Net Income 126,351       126,351    
Dividends:              
Cash ($.43, $.40 and $.38 per share for the year ended December 31, 2013, 2012 and 2011, respectively) (28,894)       (28,894)    
Exercise of stock options 265   19 246      
Exercise of stock options (in shares)     19,000        
Stock compensation expense recognized in earnings 414     414      
Other comprehensive income (loss), net of tax:              
Net change in unrealized gains and losses on available for sale securities, net of reclassification adjustments (109,436)         (109,436)  
Balance at Dec. 31, 2013 $ 1,424,408   $ 95,744 $ 163,947 $ 1,467,000 $ (43,774) $ (258,509)
Balance (in shares) at Dec. 31, 2013     95,744,000