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Consolidated Statements Of Stockholders' Equity (USD $)
In Thousands
Common Stock [Member]
Capital Surplus [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Total
Balance at beginning of period at Dec. 31, 2010 $ 15,369 $ 73,040 $ 361,680 $ 8,505  
Common stock issued 21 474      
Tax effect of stock options   46      
Stock based compensation arrangements   375      
Net income     11,355   11,355
Dividends on common stock     (3,846)    
Net change       (192) (192)
Balance at end of period at Mar. 31, 2011 15,390 73,935 369,189 8,313 466,827
Balance at beginning of period at Dec. 31, 2011 15,118 77,462 381,017 9,444 483,041
Common stock issued 27 455      
Tax effect of stock options   62      
Stock based compensation arrangements   441      
Net income     14,005   14,005
Dividends on common stock     (4,141)    
Net change       (1,933) (1,933)
Balance at end of period at Mar. 31, 2012 $ 15,145 $ 78,420 $ 390,881 $ 7,511 $ 491,957