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Consolidated Statements Of Changes In Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock [Member]
Capital Surplus[Member]
Retained Earnings [Member]
Treasury Stock [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Dec. 31, 2012 $ 333,274 $ 46,249 $ 103,524 $ 309,270 $ (124,347) $ (1,422)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income available to common shareholders 48,215     48,215    
Other Comprehensive Income (Loss), Net of Tax (3,568)         (3,568)
Acquisition 28,508   4,236   24,272  
Cash dividends declared (23,515)     (23,515)    
Stock-based compensation expense, net 1,282   (37)   1,319  
Exercise of stock options 3,427   (127)   3,554  
Ending balance at Dec. 31, 2013 387,623 46,249 107,596 333,970 (95,202) (4,990)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income available to common shareholders 52,962     52,962    
Other Comprehensive Income (Loss), Net of Tax 831         831
Cash dividends declared (24,721)     (24,721)    
Stock-based compensation expense, net 1,535   64   1,471  
Exercise of stock options 580   (290)   870  
Purchase of treasury shares (27,957)       (27,957)  
Ending balance at Dec. 31, 2014 390,853 46,249 107,370 362,211 (120,818) (4,159)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income available to common shareholders 54,097     54,097    
Other Comprehensive Income (Loss), Net of Tax 327         327
Cash dividends declared (25,618)     (25,618)    
Stock-based compensation expense, net 1,793   266   1,527  
Exercise of stock options 2,979   (602)   3,581  
Stock Issued During Period, Value, Other 1,896   (765)   2,661  
Purchase of treasury shares (7,055)       (7,055)  
Ending balance at Dec. 31, 2015 $ 419,272 $ 46,249 $ 106,269 $ 390,690 $ (120,104) $ (3,832)