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Mortgage Servicing Rights (Tables)
3 Months Ended
Mar. 31, 2012
Mortgage Servicing Rights [Abstract]  
Schedule Of Changes In Mortgage Servicing Rights
Schedule Of Other Information Servicing Loan Portfolio
     March 31,
2012
    December 31,
2011
 

Balance of loans serviced for others

   $ 2,191,215      $ 2,009,849   

MSR as a percentage of serviced loans

     0.92     0.90
Key Assumptions Used In Measuring The Fair Value of MSR
     March 31,
2012
    December 31,
2011
 

Constant prepayment rate

     19.88     20.39

Discount rate

     8.59     8.60

Weighted average life (years)

     4.6        4.5