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Cash and stock-based compensation plans (Tables)
 12 Months Ended
Dec. 31, 2012
Disclosure Of Compensation Related Costs, Share-Based Payments [Abstract]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

A summary as of December 31, 2012 of the restricted stock granted to Directors during the years 2010, 2011 and 2012 is presented below:

 

  Shares  Weighted average
grant date fair
value		 
Outstanding at January 1, 2010  62,938  $13.58 
Granted  38,115   12.46 
Vested  (13,026)  13.80 
Outstanding at December 31, 2010  88,027   13.07 
Granted  25,541   18.07 
Vested  (31,563)  13.14 
Outstanding at December 31, 2011  82,005   14.59 
Granted  32,317   22.09 
Vested  (23,493)  14.35 
Outstanding at December 31, 2012  90,829  $17.32 
Expected to vest  90,829  $17.32
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

A summary as of December 31, 2012, 2011 and 2010 of the status of the restricted stock units granted to certain Executives and changes during the years 2010, 2011 and 2012 are presented below:

 

  Stock units  Weighted
average grant
date fair
value		  Weighted
average
remaining
contractual
term		  Aggregate
intrinsic value
(thousands)		 
Outstanding at January 1, 2010  166,118  $10.20         
Granted  101,496   12.04         
Forfeited  -   -         
Vested  (44,904)  10.59         
Outstanding at December 31, 2010  222,710   10.96         
Granted  94,496   15.84         
Forfeited  (20,931)  12.63         
Vested  (69,865)  11.09         
Outstanding at December 31, 2011  226,410   12.80         
Granted  181,598   17.52         
Forfeited  (54,367)  13.88         
Vested  (85,249)  12.31      $578 
Outstanding at December 31, 2012  268,392  $15.93   2.11 years  $1,510 
Expected to vest  268,392  $15.93      $1,510
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The fair value of stock purchase options granted to certain Executives during 2012, 2011 and 2010 was estimated using a binomial option-pricing model for 2012 and 2011 and the “Black-Scholes” option-pricing model for 2010, based on the following factors:

 

  2012  2011  2010 
Weighted average fair value per option $3.01  $2.92  $2.91 
Weighted average expected term, in years  5.50   5.50   4.75 
Expected volatility  33.35%  30%  37%
Risk-free rate  0.18% to 1.34%   2.52%  2.32%
Expected dividend  5.30%  4.50%  5.00%
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

A summary of stock options granted is presented below:

 

  Options  Weighted
average
exercise price		  Weighted
average
remaining
contractual
term		  Aggregate
intrinsic
value
(thousands)		 
Outstanding at January 1, 2010  803,994  $11.58         
Granted  420,777   13.52         
Forfeited  (646)  15.43         
Exercised  (82,106)  10.15         
Outstanding at December 31, 2010  1,142,019   12.39         
Granted  72,053   17.81         
Forfeited  (58,067)  12.16         
Exercised  (240,439)  12.27         
Outstanding at December 31, 2011  915,566   12.87         
Granted  182,420   18.93         
Forfeited  (231,639)  15.82         
Exercised  (442,675)  12.90         
Outstanding at December 31, 2012  423,672  $13.83   4.15 years  $3,273 
Exercisable  92,316  $12.45   2.12 years  $841 
Expected to vest  331,356  $14.22   4.43 years  $2,432
Schedule Of Share-Based Compensation, Restricted Stock Granted To Directors [Table Text Block]

A summary as of December 31, 2012 of restricted stock granted to Directors under this plan and changes during 2010, 2011 and 2012 is presented below:

 

  Shares  Weighted average
grant date fair
value		 
Non vested at January 1, 2010  14,673  $20.45 
Granted  -   - 
Vested  (5,756)  19.95 
Non vested at December 31, 2010  8,917   20.77 
Granted  -   - 
Vested  (5,399)  20.39 
Non vested at December 31, 2011  3,518   21.35 
Granted  -   - 
Vested  (3,518)  21.35 
Non vested at December 31, 2012  -  $- 
Expected to vest  -  $-
Share Options Granted To Directors and Certain Executives and Changes [Table Text Block]

A summary as of December 31, 2012 of the share options granted to Directors and certain Executives and changes during 2010, 2011 and 2012 is presented below:

 

  Options  Weighted average
exercise price		  Weighted
average
remaining
contractual
term		  Aggregate
intrinsic value
(thousands)		 
Outstanding at January 1, 2010  207,706  $16.34         
Forfeited  -   -         
Outstanding at December 31, 2010  207,706   16.34         
Forfeited  -   -         
Exercised  (27,552)  16.34         
Outstanding at December 31, 2011  180,154   16.34         
Forfeited  -   -         
Exercised  (130,350)  16.34         
Outstanding at December 31, 2012  49,804  $16.34   1.12 years  $260 
Exercisable at December 31, 2012  49,804  $16.34   1.12 years  $260
Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block]

A summary as of December 31, 2012 and changes during the years 2010, 2011 and 2012 of the indexed stock purchase options is presented below:

 

  Options  Weighted average
exercise price		  Weighted
average
remaining
contractual
term		  Aggregate
intrinsic value
(thousands)		 
Outstanding at January 1, 2010  385,469  $17.46         
Forfeited  -   -         
Exercised  -   -         
Outstanding at December 31, 2010  385,469   17.98         
Forfeited  -   -         
Expired  (4,100)  11.87         
Exercised  (55,433)  12.12         
Outstanding at December 31, 2011  325,936   12.86         
Forfeited  -   -         
Expired  (3,542) $14.48         
Exercised  (322,394) $16.41         
Outstanding at December 31, 2012  -  $-   -  $- 
Exercisable at December 31, 2012  -  $-   -  $- 
Stock Options Granted To Employee and Changes [Table Text Block]

A summary of the status as of December 31, 2011 of the stock options granted and changes during 2010 and 2011 of these option plans is presented below:

 

  Options  Weighted average
exercise price		  Weighted
average
remaining
contractual
term		  

Aggregate
intrinsic value
(thousands)		 
                 
Outstanding at January 1, 2010  11,735   29.89         
Forfeited  -   -         
Expired  (3,615)  23.16         
Outstanding at December 31, 2010  8,120   32.88         
Forfeited  -   -         
Expired  (8,120)  32.88         
Outstanding at December 31, 2011  -  $-   -  $- 
Schedule Of Deferred Compensation Plan [Table Text Block]

A summary on changes is presented below:

 

  2012  2011  2010 
Outstanding at beginning of year  1,812   17,746   18,755 
Exercised  (1,278)  (15,934)  (1,009)
Outstanding at end of year  534   1,812   17,746