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Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2011
Significant Accounting Policies [Abstract]  
Assumptions Used In Measuring The Fair Value Of Mortgage Servicing Rights
     2011     2010     2009  

Constant prepayment rate

     20.39     18.54     18.35

Discount rate

     8.60     8.62     8.70

Weighted average life (years)

     4.5        4.5        4.5   
Share-Based Payment
     2011     2010     2009  

Dividend yield

     2.79     2.72     2.23

Expected life (years)

     7.1        7.1        7.3   

Expected volatility

     52     52     46

Risk-free rate

     2.71     2.69     2.18

Weighted average grant date fair value of options granted

   $ 4.65      $ 5.24      $ 3.65