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Consolidated Statements Of Stockholders' Equity (USD $)
In Thousands, except Share data
Common Stock [Member]
Capital Surplus [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Total
Balance at beginning of period at Dec. 31, 2008 $ 15,281 $ 67,975 $ 315,858 $ 14,677  
Balance, shares at Dec. 31, 2008 15,281,141        
Common stock issued 28 460      
Common stock issued, shares 27,600        
Tax effect of stock options   252      
Stock based compensation arrangements   1,038      
Net income     32,609   32,609
Dividends on common stock ($1.04, $0.96 and $0.90 per share, respectively)     (13,774)    
Net change       (3,654) (3,654)
Balance at end of period at Dec. 31, 2009 15,309 69,725 334,693 11,023 430,750
Balance, shares at Dec. 31, 2009 15,308,741        
Common stock issued 76 1,581      
Common stock issued, shares 76,476        
Tax effect of stock options   516      
Stock based compensation arrangements   1,218      
Net income     42,309   42,309
Dividends on common stock ($1.04, $0.96 and $0.90 per share, respectively)     (14,733)    
Common stock acquired and canceled (16)   (589)    
Shares acquired and canceled, shares (16,500)        
Net change       (2,518) (2,518)
Balance at end of period at Dec. 31, 2010 15,369 73,040 361,680 8,505 458,594
Balance, shares at Dec. 31, 2010 15,368,717        
Common stock issued 51 990      
Common stock issued, shares 50,862        
Tax effect of stock options   357      
Stock based compensation arrangements   3,075      
Net income     45,621   45,621
Dividends on common stock ($1.04, $0.96 and $0.90 per share, respectively)     (15,787)    
Common stock acquired and canceled (302)   (10,497)    
Shares acquired and canceled, shares (302,149)        
Net change       939 939
Balance at end of period at Dec. 31, 2011 $ 15,118 $ 77,462 $ 381,017 $ 9,444 $ 483,041
Balance, shares at Dec. 31, 2011 15,117,430