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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands, except Share data
Total
COMMON STOCK
CAPITAL SURPLUS
RETAINED EARNINGS
ACCUMULATED OTHER COMPREHENSIVE INCOME
Balance at beginning of period at Dec. 31, 2009   $ 15,309 $ 69,725 $ 334,693 $ 11,023
Shares, Outstanding, Beginning Balance at Dec. 31, 2009   15,308,741      
Shares issued   76 1,581    
Shares issued, Shares   76,476      
Shares acquired and canceled   (16)   (589)  
Shares acquired and canceled, Shares (16,500) (16,500)      
Net income 42,309     42,309  
Dividends on common stock ($1.12, $1.04 and $0.96 per share, respectively)       (14,733)  
Net change (2,518)       (2,518)
Tax effect of stock options     516    
Stock-based compensation arrangements     1,218    
Balance at end of period at Dec. 31, 2010 458,594 15,369 73,040 361,680 8,505
Shares, Outstanding, Ending Balance at Dec. 31, 2010   15,368,717      
Shares issued   51 990    
Shares issued, Shares   50,862      
Shares acquired and canceled   (302)   (10,497)  
Shares acquired and canceled, Shares (302,149) (302,149)      
Net income 45,621     45,621  
Dividends on common stock ($1.12, $1.04 and $0.96 per share, respectively)       (15,787)  
Net change 939       939
Tax effect of stock options     357    
Stock-based compensation arrangements     3,075    
Balance at end of period at Dec. 31, 2011 483,041 15,118 77,462 381,017 9,444
Shares, Outstanding, Ending Balance at Dec. 31, 2011   15,117,430      
Shares issued   131 2,139    
Shares issued, Shares   131,665      
Shares acquired and canceled   (7)   (249)  
Shares acquired and canceled, Shares (6,787) (6,787)      
Net income 51,900     51,900  
Dividends on common stock ($1.12, $1.04 and $0.96 per share, respectively)       (17,061)  
Net change (3,127)       (3,127)
Tax effect of stock options     1,270    
Stock-based compensation arrangements     1,530    
Balance at end of period at Dec. 31, 2012 $ 519,567 $ 15,242 $ 82,401 $ 415,607 $ 6,317
Shares, Outstanding, Ending Balance at Dec. 31, 2012   15,242,308