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Stock Option And Stock Award Plans (Tables)
 12 Months Ended
Dec. 31, 2012
Stock Option And Stock Award Plans [Abstract]  
Summary Of Stock Options Outstanding
      Option Exercise Price/Share
  Number of             Weighted
  Options   Range   Average
Outstanding at January 1, 2010 796,175   $ 13.95 to $ 19.52 $ 16.29
Granted 316,000     16.66 to   17.54   17.15
Forfeited and Expired (29,325 )   13.95 to   18.12   16.37
Exercised (65,575 )   13.95 to   15.80   15.04
Outstanding at December 31, 2010 1,017,275     13.95 to   19.52   16.64
Granted 235,800     16.87 to   19.84   19.79
Forfeited and Expired (51,800 )   13.95 to   19.84   16.78
Exercised (79,775 )   13.95 to   18.12   15.11
Outstanding at December 31, 2011 1,121,500     14.06 to   19.84   17.40
Granted 182,100     18.51 to   19.40   19.34
Forfeited and Expired (50,300 )   15.80 to   19.84   19.34
Exercised (176,600 )   14.72 to   18.12   16.33
Outstanding at December 31, 2012 1,076,700   $ 14.06 to $ 19.84 $ 17.81
Summary Of Additional Information On Stock Options Outstanding And Exercisable
    Options Outstanding at     Options Exercisable at
    December 31, 2012     December 31, 2012
    Weighted Average   Aggregate       Aggregate
    Remaining       Intrinsic   Weighted Intrinsic
    Contract-       Value   Average Value
Range of   ual Life Exercise   (In   Exercise (In
Exercise Prices Shares (Years) Price   Thousands) Shares Price Thousands)
$ - to $ 15.00 35,500 2.9 $ 14.20 $ 221 35,500 $ 14.20 $ 221
15.01to 17.00 218,800 3.5   15.79   1,013 217,000   15.78   1,006
17.01to 20.00 822,400 5.0   18.51   1,572 462,300   17.66   1,276
Total 1,076,700 4.7 $ 17.81 $ 2,806 714,800 $ 16.92 $ 2,503
Summary Of Additional Information On Non-Vested Restricted Stock Outstanding
                Maximum Non-vested Restricted  
                Stock Units Issuable Upon Satis-  
  Non-vested Restricted Stock   faction of Certain Performance Criteria  
      Wgtd. Ave. Grant Date       Wgtd. Ave. Grant Date  
  Number   Grant Date Fair Value (In   Number   Grant Date Fair Value (In  
  of Shares   Fair Value/Sh. Thousands)    of Shares   Fair Value/Sh. Thousands)  
Outstanding at January 1, 2010 45,750   $ 17.70 $ 810   72,175   $ 17.64 $ 1,273  
Granted 56,717     17.23   977   82,750     16.83   1,393  
Vested (8,284 )   17.84   (148 ) -     -   -  
Forfeited (333 )   18.12   (6 ) (4,000 )   17.10   (68 )
Outstanding at December 31, 2010 93,850     17.40   1,633   150,925     17.21   2,598  
Granted 51,360     19.42   997   88,900     19.32   1,718  
Vested (18,060 )   17.20   (311 ) (66,925 )   17.68   (1,183 )
Forfeited (1,000 )   17.13   (17 ) (87,900 )   16.93   (1,488 )
Outstanding at December 31, 2011 126,150     18.25   2,302   85,000     19.35   1,645  
Granted 94,949     19.06   1,810   87,200     18.79   1,638  
Vested (60,357 )   18.01   (1,087 ) -     -   -  
Forfeited (16,842 )   18.82   (317 ) (80,400 )   19.31   (1,553 )
Outstanding at December 31, 2012 143,900   $ 18.82 $ 2,708   91,800   $ 18.85 $ 1,730